Little, feisty creatures that love to sneak in your boxers at night then when you put them on in the morning they launch a full scale assault on your crotch.
Friend 1: Dude stop itching your nuts, what the hell's wrong with you?
Friend 2: Fool, obviously I'm dealing with crotch gremlins.
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