In a internal combustion engine when the cylinder is oversized and the piston will rock side to side producing a knocking sound.
Chad's car has really bad pistion slap
von Nobis 29. Juli 2003
The act of fuckin a loose hoe, whose pussy is so loose a man's crank will slap around in it.
When I was fuckin Cathy i suffered from piston slap.
von Paul Trahan 21. April 2003

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