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When you shake your butt like a fartsy fella and make your willy slap your hip bones like they’re enemies in a bar fight.
My cousin does a kackflap every time he sees a hot girl at the mall. It’s like he’s trying to get a free taco.
I tried a kackflap in PE and my teacher gave me a detention. I guess my willy was too rowdy.
He did a kackflap so hard, his pants fell off. Everyone laughed. I cried.