Top Definition
The honorary name given to a female who, while not physically possessing a sack of testicles, mentally has balls of steel. It is said that such a feat is acknowledged as having a sack in spirit or a "spirit sack".
Jaime's spirit sack allowed her to down a shot of tequila and tell her douche monkey of a boyfriend to go fuck himself and screw an AIDS patient.
by Gwod December 17, 2009
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