Top definition
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."
by chico del nacho September 19, 2003
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2
I didn't win jack squat when i went to Las Vegas last weekend.
by Natalie September 20, 2003
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3
there are users on this website who do not know jack squat about writing a good definition.
by Light Joker May 21, 2004
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4
I know jack squat about thermodynamics.
by piewire September 19, 2003
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5
by Hoboken Johnny September 20, 2003
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6
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.
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7
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."
by _Fabricated_ September 20, 2003
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