A Belfast term basically callin someone a cunt. Strangely it could be used as a term of endearment so instead of calling someone buddy you could say "hows it going yacuntye?"
"waddafeck ya doin yacuntye?" which translates into "what the fuckare you doing you cunt?"
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