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A group of guys (usally frat pledges) strip naked and stand in a circle. They each put one thumb in their mouth, and the other thumb up the guy's ass in front of them. They then all start walking forward in a circle at the same time. If someone's thumb falls out of the ass in front of them, they must switch thumbs, and put the now shitty thumb in their mouth. Fear of this, causes each man to be shoving his thumb up the man's ass in front of him with great force, causing great discomfort!
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