contraction from "cock chafer".
A cock chafer is a male who is
bad at recieving
anal sex, particularly it hurts the giver. Or a male who masturbates too much thus chafing his member.
This insult is used to describe
one who is irritating and grating.
Jimmy is such a cock chafer, he comes round all
the time.
da_rude was such a chafer, he
always posted the most ridiculous shit.