When a female lying on her back lets go of the dildo she is using while it's still penetrating her, then contracts and relaxes causing the dildo to rise and/or fall back into her.
Pervert; "So, I watched some pretty sick porn last night.."

Pedophile; "Oh yeah?... what made it so good?"

Pervert; "Some porn star was doing the casper ride on the hood of a jeep!"
by De *WEEZ* of AES March 26, 2009
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