Quack sack is when your balls slap around and quack like a duck.
I was walking downstairs when I had major quack sack.
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World's best insult
By Phil Lester a.k.a. AmazingPhil
Asshole: bitch
Me: you little umbrella monkey quack sack
Asshole: what?
Me: *walks away like a boss*
When a large balled man is seated, farts, and then proceeds to stand, thus releasing the trapped toot only to feel it briskly escape to the side of his massive testicles.
“Oh fuck, that was a frisky sack quack.” Exclaimed Johnny as he quickly held his nose.