It means two things.

1. The literal idea of banging one's companion

2. Shooting someone in the ballsack and running away very fast in a video game
1. One summer afternoon stand you find a nice lady, Bang 'n Run (not one night stand)

2. Ah u shot my ballsack im gonna hack ur xbox live account ****** (Bang 'n Run)
by K Factor May 30, 2010
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