A girl in college or university that takes part in excessive partying. This includes drinking every night of the week, tearing up the dance floor at every party and knows all the guys on her floor on residence.
Frat girls turn on savage mode when they drink with their best friends.
'Did you see the frat girl at that party?'
'of course you did, she's at every party'
Whenever a girl becomes so over obsessed with being involved in a fraternity that they start doing extreme actions to try and be a part of it. Almost to a self degrading extent.
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 outclubbing tonight?" "No, it's been a long week and I'm tired, so I'm just going to fatgirl it."