1 definition by Uselessman81

Top Definition
Big Bowel Movement. When one has a larger than usual bowel movement.

Also Why Black Berry Messenger's abbreviation of BBM is poorly planned.
1.) I had a huge dinner last night and just had a BBM, someone should clear the toilet.

2.) Pull the car over, I need to take a BBM.
by Uselessman81 August 04, 2010

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