The fold formed on your crotch while wearing jeans that gives the appearance of having an erection. Applies to women too.

Boner Jeans
"In math class today I had a giant joner
and Rebecca told all of her friends that
I had a hard on."

"Nicole had a huge joner in science
the other day; she pressed it away
self consciously to reassure everyone
that she did not in fact have a penis."
by laxgodmoney October 17, 2009
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The erection (boner) of a person wearing jean shorts (jorts).
Uh oh, Kev's got a raging joner again.
by Dizzy Gilespi October 2, 2008
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Joner (v): 1. to first commit to an obligation and then fail to arrive.

2. pull a fast one over the eyes as intended to deliver but failing to
Did you hear about Paul?

No. What happened to Paul?

His blind date pulled a Joner!!!

No way!!
by Digger Leemond September 9, 2010
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Though the true meaning of the name is,"the name given to the boner of a jonas brother", according to urban dictionary, it also refers to a sexual predator with a shorter-than-normal penis. Typically a "Joner" is a genetic disorder and carries on throughout most males in a family line. This disorder has been seen and accounted for in other cases in the area.
He took out his joner and started nibbling on my nipples, later cooling them with ice.
by f0bbz17 August 18, 2009
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A boy, usually around highschool age, who's ego is so much bigger than his dick you'll wonder how he hasn't been shat upon by everybody he opens his mouth to
Girl 1) omg he is such a joker!
Girl 2) ikr! Ugh I just cant
Cute monkey) *throws feces at joner and pisses on joner's face.
Joner's parents) "what have we created!?" *admitts joner son to insane asylum*
by Runaway666 December 19, 2014
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A jerk; dork, dweeb, putz, etc.
Generally used as a derogatory term for a bad driver.

(this definition predates any Jonas Brothers-related definitions by many years)
That joner was driving on the freeway doing 45 in the fast lane!
by Jonerrific September 23, 2009
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A. An erection that has a justifiable cause and is not of a random nature. B. The opposite of a roner.
When the stripper started giving him a lapdance, Brian got a joner.
by DonE BDS March 1, 2010
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