A remarkably attractive young woman; i.e. skinny, long-legged, well-dressed, and potentially a high fashion model.
1. Check out the fit bird at eight o'clock.

2. This place is a bummer, man--I haven't seen a fit bird in the joint since we've been here.
by pigeonface May 12, 2005
Brit: Me and my mates are going to check out the talent and see if there are any fit birds.

Yank: Aight, I think there are some hot chicks.
by d-rizzle512 March 15, 2009
Luke: Man, that chick is a babe!
Pablo: No, dude, she's a right fit bird.
by Corey Stoltz September 7, 2011
The overwhelming weight gain in pigeons outside the Fashion Institute of Technology in NYC due to the crazy amount of dieting the fashionista students do.
I was sitting in my office and saw an obese pigeon land on the ledge. He must have a case of FIT Bird Flu bad!
by KitKat83 December 9, 2010