jack squat 

Nothing, zero, zilch, nada, shit all. Possibly a short, fat man.

"I came out of that deal with jack squat."
"Here comes that prick, Jack Squat."

jack squat by chico del nacho September 19, 2003

jack squat 

absolutely nothing

I didn't win jack squat when i went to Las Vegas last weekend.

jack squat by Natalie September 20, 2003

jack squat 

not anything, absolutely nothing

I know jack squat about thermodynamics.

jack squat by piewire September 19, 2003

Jack Squat 

Another way to say Jack Shit.

there are users on this website who do not know jack squat about writing a good definition.

Jack Squat by Light Joker May 21, 2004

jack squat 

lack of knowledge

You don't know Jack Squat about anything

jack squat by Hoboken Johnny September 20, 2003

jack squat 

Nothing. Identical in meaning to jack shit - it's just an equivalent for people who are scared of profanities.

Your car's worth jack squat.

jack squat by super ultra hyper bishi bashi champ September 21, 2003

jack squat 

A stronger variation on the slang usage of "squat", meaning "absolutely nothing".

The origin of the phrase is unknown, but most likely it shares roots with the negatory slang usage of "jack".

"I get paid jack squat at my job."

jack squat by _Fabricated_ September 20, 2003