Definitions by Havnav

BM 

An acronym meaning Boatswain's Mate in the Navy or Bowel Movement, no wait, they're the same thing.

Man that BM3 Johnson is a real piece of shite.

BM by Havnav March 26, 2009

2 pound fly

Wrapping your testicles around the shaft of your penis, making it resemble the eyes of a large fly.

If Blake tries to show you a 2 pound fly, just look away.

2 pound fly by Havnav March 25, 2009