goldfish slap
A goldfish slap is the act of pulling out a flaccid penis and slapping it on the back of an unsuspecting persons neck, then yelling "Goldfish".
While Natasha was eating her sandwich at the picnic ,Tyrone crept up behind her and Goldfish slapped her.
Dude I totally goldfish slapped Rebecca in Math class
Dude I totally goldfish slapped Rebecca in Math class