BIM stands for Balls in his/her/your/my mouth. Used for people who you dislike or annoy you, or even sometimes for yourself, when you really messed up.
Steve- That girl over there likes BIM.
Kramer- Yeah I heard she loves balls in her mouth.
Steve- Wow I just totally got BIM right there.
Kramer- Yeah you totally missed that basket-ball shot, so balls in your mouth.
Tony-HEY STEVEN. HEY KRAMER.
Steven- Tony huge BIM.
Tony- What does that mean?
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