beef stop
Walking around in crowded areas and you realize that you have to stop for not to shit in your pants. You stop, tighten your ass balls and pretend you find something interesting, because it's not possible to walk normally and tight your ass balls at the same time.
In a supermarket with friends: 'Hey, why does Peter stop to look at those ridiculous clothes?"
Friend answer: "Probably a beef stop to keep it in there"
Friend answer: "Probably a beef stop to keep it in there"