The act of slapping a bitch, hoe, or even a woman in the face with one's penis. Optimally, a Wappy Slappy is given with enough precision and force to leave a dark-purple bruise in the middle of the forehead, usually in the shape of a large mushroom, army helmet, or garden spade.
Man, you should have the mark that Wappy Slappy left on Jane's face last night. It looked like she had a picture of Papa Smurf tattooed on her chin!
by Mooj the Taliban Man May 12, 2011
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