Whacky Sack

Testicles. See also tallywacker, whack off.

His whacky sack looks a little swollen!

salt in his sack

To have courage. To be tough. One who possess intestinal fortitude and resolve.

That cowboy has got some salt in his sack.

You got to have some salt in your sack to do that job!

MACK SACK

a term to define a chick you like but aint trying to catch feelings for

boy 1: " you trying to hook up with her"
boy 2: " nah, thought about it but for now she my mack sack"

K-Sack

Korean Ballsack. A derogatory term for something disliked.

Omg that's so K-Sack!