it is an acronym that stands for Fake Ass Bitch. used to lovingly describe someone who is fake as hell
Grace isn’t coming to the bar tonight? She’s so FAB.
Girl 1: omg! you look so fab today!!
Girl 2: thank you!! <3
F
Fine ass bitch
"My best friend is one FAB, so don't screw her over"
Acronym; Fresh Air Bowel Syndrome
When you go camping/get out of the urban air you're used to, and get some forest air and you get diarrhea or constipated.
Bob: Just a seecond, I'm going to the washroom
Jon: AGAIN?
Bob: Yeah, I got FABS
When somethings amazing or great, when something's faboulous and you can't think of a better word. Another word for bæ ✊
That skirt you have on is just fab!