Green’s Dictionary of Slang

(US campus) to fight.

1988		Eble Campus Sl. Oct.
1996		Eble Sl. and Sociability 78: Schlub ‘fight’; schmiel/schmielage ‘female’; schmiel on ‘act nice in order to pick up a female’; and schnack and schnicky-schnacky ‘affection’ sound like mock Yiddish.