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Acronym for 'Fuck It & Sleep In'

You know, the days when you wake up feeling overwhelmed: You have a headache. You've hardly slept because the neighbors were fighting/having sex/getting raided by the cops, you awoke early to the sound of barking dogs and vomiting drunks walking home from the club, You forgot to change your alarm clock for daylight savings and it went off an hour early, at breakfast time there's no toast because the bread is mouldy, no cereal because the milk has turned, no porridge because the rat in the cupboard ate it, and no chance of a McMuffin because you've lost your wallet. You hate your boss, the new departmental manager has been on your back for weeks, the customers are giving you the irrits, you suffer from anxiety from having to deal with the people in Human Resources, and it all just gets a little bit too much....

FINSI!
WTF !!

I CBA to go to work.

Bugger it all, I'm having a FINSI day !
FINSI by KeithMyArthe September 4, 2011
See what a finski can do to a person's attitude? He's going to treat it like a beautiful woman
Source: Ferris Bueller's Day Off
Finski by smithword November 10, 2014

finessin' these hoes 

Attracting many women by smooth talking and telling them what they'd like to hear.
You know I'm finessin' these hoes dawg, Hollywood gets mad bitches.

finessing the plug

Smooth talking your way into getting more dope for less, cheating your dealer.
"Me and Daquan were finessing the plug and got a half for 60"

finessional 

Professional finesse, mastered the art of finessing
"Yo boy just came up on the sack" "Oh for real? That nigga a real Finessional"
finessional by CheatCodeLo March 28, 2015

Fission Mailed

Originated from Metal Gear Solid 2 Sons Of Liberty. What is different is that they changed the first two letters in order to confuse the player. Sometimes used on messageboards to show defeat or total pwnage.
"That sign said Mission Failed so I turned the power off."

"Dude, it was Fission Mailed, they just tried to confuse you, now you gotta start all over again cause you didn't save. Pwned!
Fission Mailed by SCANK April 18, 2005