When someone slaps you arm once with each hand and then slides their hand under your arm and says double flap snail
Dude that was a gnarly double flap snail. ~S. Brown
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When someone slaps your arm twice (one with each hand) and then proceeds to snail (slide their hand under your arm) your arm, and then say double flap snail
Woah, that was one good double flap snail. ~S. Brown