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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He's warmer than you think.

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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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It does not matter how you do it. It's a Fecal Mustache.

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5
by Hoboken Johnny September 20, 2003
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The vengeful act of crapping on a lover's chest while they sleep.

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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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