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1.
Fire In The Bowl

Used in online conversation when someone is about to (or in the middle of) smoking a bowl.
also- FITMB and FITFB can mean Fire In The Mother-Fucking Bowl and Fire In The Fucking Bowl respectively.
(during online chat)
Guest 1234: FITB
User6734: Nice! i'll have a joint soon.
User487: wish i was getting high too..
User8936: bout to smoke a bowl too
by misguidedyouth June 27, 2011
 
2.
-Abbreviation for "Fuck In The Butt"
-an unpleasant experience.
"That Drake sure is a fitb."
by Nigga Stole My Bike June 24, 2006
 
3.
Freak in the bed

Mainly used on the internet.
Damn, Jessica is a FITB.
by DaddyJT10 August 17, 2009
 
4.
"Finger in the butt." Generally used as a positive remark OR negative remark depending on how you view the act itself.
The act of slipping your finger in a girl's anus while having sex doggy-style. It can also be done as an act on its own without the intercourse part.
Example 1
Dude 1: "Bro, check out that hot babe!"
Dude 2: "Oh yeah, FITB!"

Example 2
Dude 1: "Bro, this sandwich is awesome!"
Dude 2: "Yeah bro, FITB!"

Example 3
Dude 1: "Bro, I just got kicked out of college"
Dude 2: "Shit bro, FITB!"
by FITB January 11, 2012
 
5.
Fill In The Blank
Bill: Hey mike, FITB.... I _____ your mom, and it tasted like olives.
Mike: Yeah Bill, after _____ your mom I tasted olives too!
by OhThatMakesSense May 11, 2013