Technique used to prevent defecation accidents when the pressure to eliminate is so strong that the distance to the bathroom makes it impossible to reach the toilet in time.
I crowned with a turtle head and had to do the Butt Squeeze Walk (B.S.W.) in order to make it to the bathroom.
When a man is having anal sex with a girl, he is about to cum, and then the girl squeezes her buttcheeks together to stop him from cumming, he takes his dick out and lets it rip!
John: Dude, Katie gave me a brazilian butt squeeze last night. It was AMAZING.