FSIL

an abbreviation for Future-sister-in-law.

Jenn and I are FSILs for life, becuase I am marrying Nick Jonas and she is marrying Joe Jonas.

by Me =) April 10, 2008

fspanner

A FSPANNER is a describing word for somebody who is rather annoying and somewhat thick!
Sometimes in life you come across these people and they are clearly not worth wasting the time shouting FUCKING SPANNER at them so FSPANNER becomes more suitable.
FUCKING +SPANNER = FSPANNER

DUDE YOUR SOOOOO ANNOYING AND DUMB YOUR SUCH A FSPANNER GO THE FUCK AWAY AND LEAVE ME ALONE

by BISHBISH2010 September 26, 2010

FSYB

Fuck Shit Yeah Bro
or
Fuck Shit Yeah Buddy

Free t-shirt, FSYB!
FSYB it's thirsty Thursday.

by fsybitsme September 29, 2011

fshing

When people pretend to go fishing, but are actually just planning to murder people.

Dude, those guys are definitely about to go fshing, we should bounce.

by death_4421 August 28, 2013

FSWTH

Full Spectrum Warrior: Ten Hammers. A game by Pandemic Studios and published by THQ in 2006.

-Hey, do you remember that military game from 2006?
-Oh? You mean FSWTH?
-Why do you always talk in acronyms?

by VOiDPROxY June 2, 2015

FSOT

FlySafeOutThere

(parting words in a letter/note) Thanks Fred, FSOT.

by MrFalloffalot(YouTube) November 18, 2017

fsw

it stands for “fuck sea world”... yeah that’s about it:)

girl :“oh my god! fsw!”

boy:”yeah!!!! FSW”

by rp6440 January 16, 2019