S.A.D

Stands for, suck a dick

Do not confuse with seasonal affective disorder

Jon: Hey... Emily, I've been thinking... I think we should break up. Life just isn't working out y'know-
Emily: S.A.D
Jon: Yeah it's really-
Emily: No, I mean S.A.D as in Suck A Dick motherfucker

Emo

Stands for Eat Me Out
E.M.O

Not to be confused with Emu and Emo(tional)

Girl: emo
Guy: Aight