What is Ballsackimus Maximus?
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1. The muscle that makes your nutsack move vertically when you take a deep breath.
2. A general term for the scrote.
When it seems inevitable that something will hit your dude pieces, take a deep breath in order flex your ballsackimus maximus which will tuck the nuts as close to your body as possible.
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Freak addicted to Urban Dictionary.
Gi: What are u doing Fred?
Fred: Fixing up my daily U.D. word...
Gi: Your an Urbanstein!!!
See u..