sack warmer 

The act of warming ones balls by releasing flatulence within confined clothing

Yo man, my nutz were cold until I floated a sack warmer.

sack warmer by The Napalm Overlord May 15, 2014

sack warmer 

A womans chin used for resting a mans scrotum while recieving oral pleasure

Mind if I come over and use your sack warmer for a couple of hours?

sack warmer by mooseknuckles November 13, 2002