Any male that is a homosexual. Usually used in public(as many people do not know what it means) to be very derogatory while the target is unknowing of the remark.
Jaden: Look at that kid, he's such a fag.
Brock: Fuckin' polesniffer.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi