S.B.M.
Stupid Bitch Monkey.
This word is used to call someone a "stupid bitch". It is used in an offensive or playful way. Someone who is a S.B.M. would probably say or do something very retarted. They might also hurt your feelings in some way. Use this word as a comeback or a noun.
Girl: I can't go to the bowling alley with with you tomorrow.

Friend: You S.B.M.!! 