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Hang brain is not the act of placing your scrotum on someone or something as noted in the other definitions. That would be "tea baggin." Hang brain is just the act of hanging your scrotum (testicles and all) out of the zipper of your pants.
The doctor wanted to see check my scrotum for unusual lacerations, so he asked me to hang brain.
by AT February 04, 2004
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