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The thin pocket that keeps your scrotum in place and not in your Hi-Tecs.
Christ, ive torn my nadsack! thats the last time i watch American Pie 3!
by RichTbiscuits December 05, 2003
Scrotal sacks
Oh shit, nad sacks!
by European Bob May 06, 2003
My nad sack is sweaty.
by Tuset September 25, 2010