A nut sack or scrotum that has become extremely sweaty or in any way extremely smelly to become unbearible and the smell can be easily detected thru the pants and underware of the man wearing them.
Dude, I walked by that sweaty guy and he had a bad case of rancid sack.
by Mr.Man of Sri Lanka July 26, 2009

5 Words Related to rancid sack

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