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Firstgirlfriendisitis 

1) A condition in which a person is so overcome with lust and affection for their first girlfriend that they tend to act in an irrational manner, and adopt the belief that relationships are all "gumdrops and rainbows in perfectland."

2) An advanced state of being lovesick for one's girlfriend.

The person is almost guaranteed to suffer temporary depression, threaten to attempt suicide, become pussy whipped, abandon pre-existing friends, cancel prior plans so he/she can "spend more time" with their girlfriend, spend massive amounts of unnecessary money on dinner/movies/flowers/her bills/candy/etc, or all of the above.
Guy 1: "Dude, where the hell has Frank been!? I haven't seen him in over a month!"

Guy 2: "He's got a bad case of firstgirlfriendisitis, man. He started dating Suzie, and he ended up spending the money he was saving for college on her!"
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VERB- To relax at home during one's free time, as a fat girl might do on a Saturday night. Often includes watching television, drinking beer, lounging lazily on the couch.
"Are you going out clubbing tonight?" "No, it's been a long week and I'm tired, so I'm just going to fatgirl it."
(verb) to impede one's significantly more attractive friends from enjoying themselves because one is obese and unattractive.
Dan: So, how was did your night with Liz last night?

Bob: Eh, it was going good until Katie fatgirled me and made Liz leave.
fatgirl by GrigShow January 4, 2009
v. To eat the rest of a bagged snack food by shaking the remaining contents directly into one's mouth.
Do you want anymore of these chips, or can a just fatgirl them?
fatgirl by Schira October 22, 2007

fatgirl slim 

A condition or state (term is based on the name of the UK group "Fatboy Slim") wherein:

1) A fat girl eats like a bird in public, thereby suggesting that she is fat NOT because she eats everything in sight, but because she suffers from some kind of thyroidal dysfunction
2) A fat girl has lost weight & yet managed to retain good qualities developed from when she was a fat girl (such as her low-maintenance personality or sense of humor)
Girl 1: You think Maggie really has a thyroid problem? Whenever we get lunch she eats like, half her sandwich and drinks Coke Light..
Girl 2: Yeah, no. The guys left a hidden camera in that classroom that no 1 ever uses & caught her wolfing down 3 Big Macs after school hours.
Girl 1: So she's a run-of-the-mill fatgirl slim..
fatgirl slim by catfight12 January 5, 2009

Fastgirl 

A woman who rides her R1.

A woman who is capable of introducing you to a whole world of hurt if you disprespect her.
Daaamn you see that Fastgirl? She rides the shit out of her R1!
Fastgirl by Fastgirl March 9, 2009
A verb to describe when a beta provider or other low self-esteem man is suckered into a relationship by an overweight woman, because he is too much of a nice guy to risk hurting her feelings.
My cousin got fatgirled and now my brother has too.
fatgirl by 0hBrother September 4, 2025