when you fall out of a car, bike, etc., and scrape your balls on the floor
Man we were going 80 and i fell out of the car. Got some major ball sack road rash you gotta see.
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when someone opens the car door and pushes a friend onto the road while holding on to them, the road will give the person a horrible rub burn on their balls.
friend: lets give this dude a road sack
other friend: alright bro
me: AAAHHHH