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Ballsackimus Maximus

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.

by Captain Tubesock December 13, 2007

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