A word used by people from bumblefuck Wisconsin to refer to people mainly from Northern Illinois. It means Fucking Illinois bastard. Lets face it they are jealous because there is no word that has been made up by people from Illinois to describe Wisconsin people. My father always told me that bastards call people names.
People from Wisconsin that use the word FIB should get a life.
by ThatFIB September 17, 2013
Happy St. Patties Day!
When your ass itches before, after or both after taking a runny shit. It sometimes takes half a roll of toilet paper to get it resolved. Fucking itchy but syndrome.
I've got the fibs after those wings last night.
by Joe sikorski February 02, 2007
Happy St. Patties Day!
acronym - Fun In Bed, specifically regarding hot chicks

Get your ass over there and talk to her dude, she's guarenteed to be FIB - just look at her!
by JP33 September 10, 2007
Happy St. Patties Day!
Verb โ€“ to fib. To be harmonically proportionate in face or body features. Fib could also stand for rapid, exponential growth.

Fib is short for Fibonacci Series, a series of numbers (1, 1, 2, 3, 5, 8, 13, 21, 34,....) that show constantly in nature and appear to underlie all processes of organic growth.
ex 1: She is not exactly a supermodel but she surely fibs.

ex 2: He is a moron but his career is fibbing.
by Riffi April 24, 2008
Happy St. Patties Day!
FIB - Friend In Bed

A cleaner and nicer way to say to say fuck buddy for the terminally polite. So clean you can say it in front of Grandma.

First used by Requiem in Danse Macabre of the Anita Blake Series by Laurell K. Hamilton.
Dude 1: Whats the deal with you and Julie?

Dude 2: She just my FIB.

Grandma: Fib?
by AnitaBlakeLover April 22, 2011
Happy St. Patties Day!