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1. What happens when diarrhea sudden goes explosive, unexpectedly, can be dangerous. Most of the time painful.

2. Similar to a jump, but happens when your friend or a complete asshole comes up from nowhere and stabs your ass, literally, with a sharp object/lethal weapon. Unpleasant and a dick head move.

3. A sly sexual move.
1. Dude, oh my god, I just had an Ass Ambush and it burns!

2. I was walking home on a rainy day when I was a victim of an Ass Ambush.

3. During sexual intercourse, the man tried to perform the Ass Ambush, a very sly move on his part.
by A Shit Being December 27, 2010
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