FSI

Forsure InshAllah (FSI)

This word is used when a flakey dude cant own up to make a real commitment and knows he's probably gonna flake. So he adds an "InshAllah" to the end of forsure.

Dude 1: Dude im totally coming tomorrow don't worry I wont flake.
Dude 2: Dude thats what you said last time
Dude 1: Nah dude this time FSI

*Tomorrow comes

Dude 2: Dude you totally flaked
Dude 1: Sorry dude, I was busy

by Mothug March 6, 2021

FSI

The latest in fuel injection technology released by Audi/VW. Not to be confused with "You FAssi" which means you are a loser! lol

This technology is said to increase power output and improve fuel economy at the same time. FSI is the same, minus the TURBOCHARGER. Is it any good? You betcha!

by SAF-E December 26, 2007

FSI

Acronym for Fucking Strong Information. Used after particularly effective emails or witty retorts.

Person 1: Last night I ate 13 onions and called out a Poodle.
Person 2: Yeah but you're gay
Person 3: FSI !!!111!

by Johnny Fingerbang November 27, 2007

FSI

Forced Social Interaction

This ice breaker is a totally lame fsi.

by avi18 January 4, 2017

FSi

n : Football Streaming info. Information about football streams on the internet.

FSi says you will be able to watch Graceful Association v Tootsybootsy FC on Ching Chong Sports (TvRats)

by fracturildo September 2, 2008

FSi

n : Football Streaming info. Information about football streams on the internet.

FSi says you will be able to watch Graceful Association v Tootsybootsy FC on Ching Chong Sports (TvRats)

by fookinho September 1, 2008

FSI

Feeling sick inside

Opposite of LOL

Giant catastrophe I'm FSI.

by Exmax3 August 30, 2017