A folding of the jeans in the crotch region of a pair of jeans that results in a small to medium sized uprising when worn. Usually found when worn by girls, although they can be found in certain males who either have microscopic genitalia or who wear loose jeans.
*"Cute Girl" glances at Joe*
*Joe notices said "Cute Girl" and gets excited*
*Everyone screams because of his Joner as he tones it (his dancing) down and tries to hide it*
And that my friends, is a Joner.