Acronym for "Can Occasionally Be A Cunt". Used to describe an individual who is typically a friend and generally pleasant to be around, though they sometimes may act unfavorably or have a whiny or bitchy personality once in a while.
Jordan: Do you know Steve's buddy Dan? He asked if he could bring him with tonight but I've never met the guy before...
Greg: Dan's alright. A little COBAC, but generally pretty cool.
Greg: Dan's alright. A little COBAC, but generally pretty cool.
by queens.edu December 10, 2012