Green’s Dictionary of Slang

(US campus) a pretentious fool.

1996		Eble Sl. and Sociability 78: The foreignness of the sound seems to be a large part of the appeal of borrowing in slang. Mock Latin doscus and its clipped derivatives dosc and dosh mean ‘fool; as does their pompous-sounding synonym dorkus pretentious.
1997		Da Bomb Summer Supplement 5: Dorkus (n.) A stupid, silly person.