Top Definition
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
作者 Nobis 2003年7月29日
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.
作者 Paul Trahan 2003年4月21日



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