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
viết bởi Nobis 29 Tháng bảy, 2003

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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.
viết bởi Paul Trahan 21 Tháng tư, 2003

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Lotsa space for your liquids.

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The Urban Dictionary Mug

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Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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