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
"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!"