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To grab a guy's wiener and whack it hard against a girl's face like she owes him money.
My cousin did the LaBamba Slap to my aunt after she said his breakfast was 'moldy and sad.'
He did the LaBamba Slap to the barista because she didn't give him extra whipped cream.
At the party, he slapped the girl's face with his wiener because she said his dance moves were 'cringe.'