Fentanyl, or fent, used to refer to a street opiate stronger than heroin. Thought to be a mistaken pronunciation of “fent” as in “fet-a-nyl”. Also called fetty for the same reason.
“Hey man, gimme some of those dirty 30’s

“Yeah, the ones with fet?
by Stella Shines June 14, 2022
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A blunt or spliff filled with heroine, Crack, and sometimes weed.
Yo Joe want to come smoke a fet.
by Drugyyyyyyy August 15, 2017
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A shorthand for feter (fet rhymes with get), which is a unit of length measurement defined as a quarter of a meter. It's close to the unit of feet and is thus pronounced as "feeter", which rhymes with and is spelled in the same manner as meter. It's a compromise unit between imperial and metric systems.
Look at that giant dude! He must be at least eight fets tall!
by PragmaticProgress November 30, 2019
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Dumbest prick in existence, known for aggravating and annoying the fuck out of everyone who lives under the atmosphere including his own parents. 8:10 chances most mark fets are legitimately homosexual.
No one wants to be a Mark fets
by Mark fets April 21, 2019
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Dumbest prick in existence, known for aggravating and annoying the fuck out of everyone who lives under the atmosphere including his own parents. 8:10 chances most mark fets are legitimately homosexual.
No one wants to be a Mark fets
by Mark fets April 21, 2019
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