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The act of having sex with your partner and right before you ejaculate you pull out and cum into your hand. From there you slap the face of your partner making it look like they've been slapped by a snowman.
Frank gave the Ginger Kid a Snowman Slap they'd never forget.

Peter Snowman Slapped Sally when she wasn't looking.
by Dalan Hansen & Ivan Lagrone July 11, 2006