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when you attempt a 50-50 on on a ledge or rail while riding a skateoard, you dont pop enough and your back truck doesnt make it on.(like a backwards smith gring)
"Bro you fuckin suck, quit doin penis grinds and land it."
by Harri Balsonya March 03, 2009

Words related to Penis grind

50-50 grind shitty skating tits