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A game related to "slug bug" and "punch buggy" and "prius poke," crappyslappy is when you slap someone you are with after seeing a crappy car (rusted, garbage bag for windows, broken taillights, etc.)
Person 1: "Hey, look at that shitty car!"

Person 2: "Crappyslappy!"

Person 1: "Ouch why the fuck... ohh damn you got me!"
by Keevaan August 01, 2011