Even Cleaveland's definitions

Whack Sack

Common name for "testicular akathisia"--also commonly known as "jimmy nuts": an uncontrolable urge to persistently shift, manipulate, or joggle one's testicles.

"Yo--he got he the Whack Sack serious. Dude plays with his nuts all day."

by Even Cleaveland January 3, 2007