scumball adjective 1noun 1forms 3 adjective1 •(slang) Sleazy, disreputable, or despicable."I can't help it if your uncle and his scumball friends keep crawling out from under every rock that gets turned over in this town." — 1999 noun1 •(slang) A sleazy, disreputable, or despicable person; a lowlife."Answer me. How would you feel if I was the one who might get knifed in the gullet by some scumball?" — 2002 formsscumballs · more scumball · most scumball