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A stupid show-off move where you pull out your nuts and let everyone see them all hairy and gross, like you’re showing off your ugly junk for no reason.
My cousin did the hairy gum at the party and everyone laughed at him like he was a fool.
He tried to do the hairy gum in front of his crush and tripped and fell.
At the gym, some guy did the hairy gum and got yelled at by the trainer.