a insult usally directed towards a pricish person. Possibly made up while rambling anger towards a person.
God dammit! Ur such a fucking jack nut!
by PoniesArntUs April 7, 2009
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when a gentleman has very small testicles (or possibly humongously large ones)
check out the jack nuts on him, he looks like brad micklea!
by biz markee August 21, 2003
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Some one lacks intelligence or simply forgets he's being stupid in other words it's a word that i made up and gave the meanin to my bro travis
"hey travis u r being a total cracker jack nut"
by mr.3000 April 22, 2008
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When you are hitting on a guy and another girl/guy swoops in and steals them away.
I was talking to Matt and Christa came over and nut jacked me.

Whenever I got to the club with John, he always nut jacks me.
by blsquared January 11, 2009
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