Kapow! Grontsch! Whammo! One of the greatest things about comic books is the crazy onomatopoeia you'll come across. Here's a list of some far out onomatopoeia from Star Wars comics. These are only a small fraction of the far out onomatopoeia you'll find in Star Wars comics. You'll find a source list at the end in case you'd like to examine the comics closer by yourself.

Droids, creatures and voices
Doot a-brie weet!: R2-D2 - "a-brie"? you want cheese now? (MUG)
Eeeeeyyyyaaahh!: Lando falling off Cloud City - I'd probably sound like that too (MCC)
Fnrrg! Gnrrarrg snnruff snroo!: Tott Doneeta communicates with monster (TOJ)
Gnng!: Dr. Evazan when struck by Obi-Wan's lightsaber - sounds more like he's in the loo. (MSG)
Grrarrooarr! Grroogh gnarrgh! Whnuff!: Monster communicates with Tott donneta (TOJ)
Gree-aargg!: Behemoth from the World Below roars (MWW)
Gyaaaaaaaaaaaaa!: old Serphidian guy being attacked by a carnivorous plant (MSE)
Hrmm! Hrmm! Hrmm! Hrmm! Hrmm!: Banthas (OUT)
Plap!: Sith lord claps his hands (JvS)
Rrrrrrrrrrrrrrrrrrmph?!: Chewie changes his mind (MTD)
Skreeeeeaw! Yi! Yi! Yi! Yi! Yi! Yi! Yi! Yi! Yi!: A flying monster chasing a bunch of scared Hoojibs in a cave. (MPL)
Squeee!: R2-D2 - R2's a fangirl?!? (MSW)
Uuurruuhhhhhhhhhhhhh! Splutt!: Hutt rolls over a Sith soldier (TSE)
Whoooooo!: Tusken Raider - who you ganna call? Ghostbusters! (MSG)
Wurfle!: Chewie wants woffles? (MSS)
Unfff!: Xizor takes a knee in the groin - not even reptilians are immune to that sort of thing (SOE)
Yyiiiiiiiiii!: Some guy falling off his swoop. (MBW)
Yyiii-gnngnh!: Leia's caught in an explosion - no, not an asplosion! (MLA)
Za-ditta vr-doot blaap!: R2-D2's PO'ed (MDR)

Explosions and general destruction
Aaaggh! Krapoom! Vrupowwm! Spakash! Imperial airspeeders crash into a wall (MCB)
Bah whoom bu whoom!: explosion on Tatooine - no there are no sheep. (OUT)
Ba-vlooom!: Cody Sunn-Childe's city blows up - thank the Force (MCS)
Blooey!: an airspeeder crash (MBC)
Crrunsshacrasshh!: several sandcrawlers crash (BLA)
Frratch!: a solar panel of a TIE-fighter being damaged (MSV)
Hrrrmmbblle! Srreeeee! Krarurmpsh!: A mountain of garbage lands on top of a big monster (MSB)
Krakakarooom! Ch-chowm. Thaboom! Pchak! Chak! Chak! Pawing! Ftow!: Shira Brie strafing a bunch of nomads (MST)
Kraka-thoom!: a space ship explodes (TOJ)
Krapowm!: an Imperial battleship exploding - hold on a second.... "krap-owm"? What the...? (MSV)
Krazzzhasshht!: The Darker is zapped by his own energy shield (MTD)
Krinkatlesh!: A giant flying monster crashes into the center of a crystal-filled cave. (MPL)
Pa-ba-ba-boom!: Imperial skimmer crashes on Bespin - wow, it has a "pa" and two "ba"s!! (MHB)
Pa-ba-fawhoom!: a section of a star destroyer exploding - I've always liked the preludes to the explosion itself (MSV)
Pakoonch!: a monster crashes into a cliff-wall (MSB)
Pakrash!: TIE-fighter "pakrashes" into an ice asteroid (MTT)
Parapoom!: a bridge is blown up (MTT)
Poom poom p-p-poooom!: The City of Bones explodes (MCB)
Shaloooosshh!: huge water tanks with a terrible leak (MWB)
Shrakow!: Luke firing an ultra-power blast - sounds more like a Eastern European name to me (MSV)
Splontssh! Krabarooum!: Imperial airspeeder is hit by a trough of porridge and crashes (MCB)
Uuuurrrroarrrkram!: a TIE-interceptor crashes (CEM)
Va damm! asteroid explodes - Van Damme? (SOE)
Veebroomm!: a TIE-fighter's hit and explodes (MES)

Guns and blasters:
Beeyow! Beeyow!: laser shots (CEM)
Buktchoom!: a net being fired from a net-gun (DKA)
Bzztt! Zzapp! Zzttt! Chow!: a shootout (EVO)
Kr-blazz!: Serji-X Arrogantus' laser gun. (MWW)
Sha-brak!: Blaster-bolt hitting its target - sounds almost like 'Zabrak' (MWW)
Shtoom! Brak! Briit!: Valance and his men fire their blasters (MSH)
Speeeyow!: laser shot - a refreshing variant on "beeyow!" (CE2)
Vipt!: Laser shot (OUT)
Vtt! Vtt! Vtt!: Sith swoop laser shots (JvS)
Zzzz!: Leia shooting a stormtrooper (MSW)
Zzzzz!: Han blasting open the door to Leia's cell - it's the additional 'z' that makes the difference (MDS)

Lightsabers
Fzipp!: Obi-Wan ignites lightsaber - not Obi-Wan has to wee (MDV)
Shrruumm! Shr-zzmm!: Lightsaber duel (DE2)
Snapzzt: Githany's lightwhip - a good thing she's not into SM (JvS)
Shwsht!: Ki-Adi-Mundi lashes out at, and hits, a Rodian (OUT)
Ssszzhh!: Ancient lightsaber (TSE)
Vmmmmm!: lightsaber hum (JvS)
Vramp!: Luke lashes out (MDW)
Vrrrramp!: Luke stabs a huge monster in the guts (MSB)
Vrrrrmmp!: Luke ignites his lightsaber (MST)
Vworp!: Luke cuts down some stormies (MEL)
Zzorp!: Kiro uses a lightsaber under water (MAA)

Machines and mechanics
Frumpf!: landing pad hits the ground (CE2)
Gnnnnn!: a door opens (CE2)
Ker-snap!: a cord snaps (BLA)
Pip!: Lando Pushes a botton (MCC)
Phoof!: the light goes off (MSU)
Puk!: Lando deactivates Lobot. (MCC)
Rrrrmmmbblllll!: Death Star trash compactor - basically just a more interesting way of spelling 'rumble' (MDV)
Rrummmm! Rrummmm!: swoops - yohoho and a bottle o' rrummmm (EVO)
Shhhhhhafow!: Jetpacks (MGN)
Tup! Tup! Tup! Tup! Tup! Tup! Tup! Tup! Tup! Tup! Tup! Krash!: GNK droid falls from a high distance, while walking (DRR)
Zisp!: Door closing (MSS)

Various acts of violence
Ffupumb!: Lando kicks two stormies. (MCC)
Grog! Whung! Crong!: Trandoshan hitting himself repeatedly in the face with a metal pot (OUT)
Krk! Snpt! Krk!: Force grip (JvS)
Thlap!: Ponda Baba punching Luke (MSG); Chewie slapping... sorry, thlapping, an Imperial officer. (MDS)
Whakam!: Lobot suckerpunches Lando - Whack him? (MCC)
Wrap! Wud!: Leia giving Han an elbow in the temple and a knee to the face - at the same time (MSS)

Sources
BLA = Sandblasted
CEM = Crimson Empire
DE2 = Dark Empire II
DRR = Droids: Rebellion
DKA = Droids: The Kalabra Adventures
EVO = Shadows of the Empire: Evolution
CE2 = Crimson Empire II
JvS = Jedi vs. Sith
MAA = Marvels Star Wars: Still Active after all these Years?
MBC = Marvel star Wars: The Big Con
MBW = Marvel star Wars: Behemoth from the World Below
MCB = Marvel Star Wars: Death in the City of Bones
MCC = Marvel Star Wars: Coffin in the Clouds
MCS = Marvel Star Wars: Dreams of Cody Sunn-Childe
MDR = Marvels Star Wars: Droidworld
MDS = Marvel Star Wars: Death Star
MDV = Marvel Star Wars: In Battle with Darth Vader
MDW = Marvel Star Wars: Doomworld
MEL = Star Wars Marvel: Ellie
MES = Marvel Star Wars: The Empire Strikes
MFB = Marvel Star Wars: Hello, Bespin, Goodbye
MGN = Marvel Star Wars: Gorath Never Forgets
MLA = Marvel Star Wars: A Last Gift from Alderaan
MPL = Marvels star wars: Pliff!
MSB = Marvel Star Wars: Bazarre
MSC = Marvel Star Wars: Six against the Galaxy
MSE = Marvel Star Wars: Serphidian Eyes
MSH = Marvel Starwars: Hunter
MSS = Marvel Star Wars: Star Search
MST = Marvel Star Wars: Shira's Story
MSV = Marvel Star Wars: Screams in the Void
MSW = Marvel Star Wars: Star Wars
MSU = Marvel Star Wars: Dundown
MTD = Marvel Star Wars: The Darker
MTT = Marvel Star Wars: To Take the Tarkin
MUG = Marvel Star Wars: The Ultimate Gamble
MWB = Marvel Star Wars: The Waterbandits
MWW = Marvel Star Wars: Showdown on a Wasteland World
OUT = Outlander
SOE = Shadows of the Empire
TOJ = Tales of the Jedi: The Collection
TSE = Tales of the Jedi: The Sith Empire