A hot sexy cowboy who sexes up Ennis on Brokeback Mountain.
"That fishing pole ain't never touched water. Jack Twist?! Jack Nasty!!!"
by Ted'n'Jeff March 6, 2006
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Refers to a scene in the 1997 short story and 2005 film Brokeback Mountain where the character of Alma confronts her husband, Ennis about his ongoing relationship with the character Jack Twist.

Denotes a fan of the story and/or movie.
Quote:"Don't lie to me Ennis. I know what it means. Jack Twist? Jack Nasty."
by Marceline8 March 14, 2006
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Alright kids, a jack nasty is where a boy usually high school or younger who can't get laid masturbates 'jacks off' into some tissues. Since he is often not one to properly discpose of them, they drift about the room and eventually make their residence beneath his bed.

The resulting hard, crusty tissue wad peeking out from beneath the mattress... Is a jack nasty.
Person A: What's with the tissues, dude?

Person B: Nothing!

Person A: Man you was makin' jack nasties!

OR:

Man that chick was so fine but I'll never get with her. I cry alone at night and make jack nasties.
by Alexander C.R August 9, 2005
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When your female sex partner refuses to have sex and you masturbate until she gives in.
I had to do the jack nasty last night to get laid
by mk6turbo June 2, 2014
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Unfortunate genetic disorder or botched female circumcision in which the vagina and uteral region appear as though Crocodile Dundee went dynamite fishing in the female genitalia.
While she was doing the human pretzel, I gave the Chinese gymnist a jack nasty face with a sledge hammer, some barbed wire, and egg beaters.
by Rufus December 17, 2004
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Getting figuratively raped, Or having gotten as such. To be beaten figuratively or literally in such a way, that you feel like someone jacked off onto your soul.
As in:

The boys Varsity lacrosse team just got beaten by 7th grade girl's. NASTY JACKED

Can be used as a descriptive, or action word as such:

"Damn man you see that hot chick"

"Yeah"

"You should go out with her"

"I already have, we fucked"

"How was it???"

"Turns out shes my 2nd cousin"

"AHAHAHAHAHA DAAAAAAAAAAAMMMMMMMM, you just got NASTY JAAAAAACCCCCKKKKKEEEDDDD"
by johnny mc awesome July 20, 2009
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