Top Definition
The bottom of a man's sack.
Jon:"Brian does your Under Sack smell?..mine does.
Brian:"No I wash my Under Sack everyday.
by B-dizzle and J Bird May 08, 2010
2 Words related to Under Sack
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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