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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When your dick reaches full excitement, but your boner only goes up to 1 inch long.
Jonah Choi had a joner today in the middle of presenting a report.
by Cockisgoody June 8, 2011
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Joner is when your jeans form a boner like form, when really your limp as can be. Although to others it may appear like your rockin one.
" I was sittin in class and noticed i was gettin some strange looks, later i realized it was probably because i was rockin a dirty ole Joner"
by Alexander Campbell September 12, 2011
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n, Slang.

A red-haired, pale skinned person, who is a suspected Amish.
His curly and fiery locks pervaded the gloom; pale skin shone like the moonlight. But it was his beard that made it perfectly clear - he was a joner.
by Boaz September 16, 2004
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