Undersack

The underside of a man's ball sack.
Her tongue gently caressed his undersack as it moved back towards his taint.
by JizzlePizzizle August 30, 2010
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Undersack

The male version of cleavage.
Don't show so much Undersack, you'll be called a slut
by Picklei Volcof March 30, 2017
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undersack

A synonym for diaper.
“I have to get rid of these dirty undersacks!”
by anonymous March 01, 2023
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