These are the girls who aren't real fans. They're incredibly annoying, have never looked at a dictionary, and tend to abuse the caps lock key. Mainly in the tween age group, it is very easy to tell when one is a Jonas Fangirl.
They are obsessed with the Jonas Brothers looks, and get mad when someone dates a Jonas Brother (other than themselves.)
Occasionally, they even yell at other fangirls who think a certain Jonas is theirs, which has led to many arguments. If someone says their opinion and happen to not like the Jonas Brothers in any way, the fangirls have a spaz attack and attempt to insult the other person with unintelligent remarks.

Not to be mistaken for a NJF (normal Jonas fan.)
Guy: I don't like the Jonas Brothers music, they suck at singing.
NJF: Oh. I like their singing, but that's your opinion.
Jonas Fangirl: OMGGG THEY R SOOO GREAT U R JUST JELOUS CUZ I BET U CANT SINGG ND THEY R PERFCT SOOOOOOOOOOO HAWTTT AND LYKE THEY HAV PURTY RINGS SO THEY R BETTER THEN U.U DONT NO GUD MUSIC SO F*** OFF YOU GAY F**!!!!!1!!11ONE!
by AlexaJ September 1, 2008
Get the Jonas Fangirl mug.
Stupid girls usually who are between 12-17 who worship and pray and dream of having sex with the Jonas Brothers. They are mindless bandwagon followers who can't spell argue or think of any reason to like the Jonas Brothers than their (lack of) looks. They are like zombies you can't kill legally.
"Oh god those Jonas Brothers fangirls just flamed me for not being a zombie and liking the JB
by AlisaGirl1990 August 23, 2009
Get the Jonas Brothers Fangirls mug.