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Chin sacking is balling your fist up and putting the hollow of your hand on a person’s chin, which resembles a scrotum. If done to a person who doesn’t know what’s going on its pretty funny. (tell them what it means afterward.)
try doing the chin sack on someone.
by JakeD. January 09, 2006
A name givin to a person with either a large flab of skin under there chin. Or to those with hair that grows only below there chin. The hair is uselly short an has a wirey texure.
(a) Hay, is that guy a Chin Sack? look at all that flabby skin.

(b) Yo Chin Sack, ya shave that stubby beard of yours yet?
by Shane Henderson December 23, 2005