1b) the exclamation you make as you punch him
2) badly misspelled attempt at writing douche (short for douchebag, as in he's only good for flushing old cum out of a whore's cunt!
Deke: Which one of you cupcakes wants to give me a blowjob?
John punches Deke deep into his neck fat, while loudly exclaiming, as if making a karate move, "DOOSH!"
John, thinking, "I knew I shouldn't have brought that fucking douche!"