When Frankie, Nick, Joe, or Kevin Jonas experience an erection ((boner)) which usually is displayed in a rather large and noticeable way. Girls go craaaaaaaaaazy!...lol
*Joe Jonas is on stage, doing his celebration dance*
*"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.