Fbt 

Fbt is also known as "Fer bour toi" in Mauritian Language.
in English "Go Fuck yourself"

Eh Fbt "pilon/pitin/noob"

Fbt by Fer bour toi April 25, 2017

FBT 

FBT or Fat Boy Tan is the instance in which an overweight white male sits down in the sun and gets a tan line on his fat creases. Can also occur to normal weight people in the naval area.

Bro did you see Jeremy’s FBT from mowing the lawn last weekend! That shit was crazy!

FBT by -_- :-( July 6, 2018

FBT 

Full Body Tense. Where one tenses their whole body to complete an action .

Me: I just took a massive shit!
Friend: Cor blimey! What was it like?
Me: It was so bit I had to a FBT!
Friend: Nice!

FBT by SerpentPrince May 2, 2019

FBT 

Short for Fuckboy Trash
A fuckboy who is trash this belongs in the trash

Sploosh Ahmed is a FBT
Don’t waste your time, he’s a FBT
Discard him, he’s a FBT

FBT by Kuukuu September 9, 2020

FBT 

(Face Book Tease) Elusive Facebook user that leaves people hanging in interesting parts of conversations.

Dude, Bernice keeps going on and offline in the middle of our fb chat. Totes fbt.

FBT by bbananas January 13, 2010

FBT 

Fuck boy tierney : military background douche bag hair cut, fucks anything with a pulse, gets drunk off of two beers then wants to re-enlist while crying, drives a big truck.

That dudes such an FBT

FBT by Fbt May 18, 2018

FBT 

An acronym for FAT BOY TENDENCIES. Used when consuming excessive quantities of unhealthy foods that fat boys love.

Oh fuuuck bro!! You just ordered a California Carnitas Chimichanga? That's hella FBT!!

FBT by SnuKs September 1, 2008