Giving somebody a crystal spring turtle is a sexual act. It involves one parter "prairie dogging" a piece of feces in and out of their rectum, while the other either urinates or ejaculates on the half protruding feces. The partner then pulls the feces back in, like a turtle retreating into its shell.
Guy #1: Hey bro i heard you gave Sally a crystal spring turtle last night

Guy#2: Hell yea man! I crystal spring'd all over that turtle!! Jealous??

Guy#1: Uuuhh...not really
by Badassboyscout May 14, 2009
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