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A FIA means a freak in action. It is an adjective for someone who acts crazy or strange.
Sydney, you’re being such a F.I.A.
"Bitch dropped the ball on that one"
"FIA, man, FIA"
F.I.A. by Joel September 7, 2003

F.I.A.T. 

"Fuck In A Truck". This would be the guy in the huge truck that makes harassment of innocent drivers on the road his regular business. M.O. includes tailgating, taking corners with little-to-no breaking, and possessing a generally obnoxious, pissed off type of energy. Typical F.I.A.T. behavior includes (but not limited to): riding your ass for going ONLY 15 mph OVER the speed limit, then whipping around you and deafening you with his pimped out dual exhaust system, and completing the transaction by squeezing back in front of you in the 30" inches you left between yourself and the car in front of you. Also, vehicle of choice most commonly includes a decal of Calvin pissing on a ford/chevy/dodge logo adhered to the back window.
I couldn't see the pedestrian crossing the street, officer, because I was temporarily blinded by some F.I.A.T. and his 1 million watt headlights riding my ass for the past 10 minutes.

or

On my way home from work tonight I thought I was being followed by a U.F.O. But... it turns out it was just a F.I.A.T.
F.I.A.T. by Jessica Scholl December 9, 2008
The repairing of a Fiat
Hey Fix It Again Tony
F.I.A.T by leach man October 31, 2003
F: fix
I : it
A: again

T:tomorrow

Which is a great way of discribing a fiat!
Fix it again tomorrow is a really rubbish car company f.i.a.t

M.A.F.I.A 

Pronounced Mafia

An abbreviation of Minor Authority Figure In Action.
Somebody with a small ammount of power that lets it go to their heads and takes it very seriously. They actually enjoy using their tiny piece of power to cause upset in other peoples lives and were nearly always bullied at school. Commonly found spouting such gems as "I dont make the rules.." and "I'd love to help you."
These people include Traffic wardens, bouncers, security guards and the adolecent managers of McDonalds restraunts.
Bouncer: "Sorry mate no trainers."
Kev : "But that Guy just went in with trainers on."
Bouncer: "Sorry mate I dont make the rules"
Kev : "Well can I just go in and tell my mates I cant get in?"
Bouncer: "No"
Kev : "Ooooooo, Hark at the M.A.F.I.A."

Traffic Warden: "Im going to have to issue you with a ticket."
Dave : "What? The Meter ran out less than a minute ago!"
T.W : "Im sorry mate I dont make the rules."
Dave : "Fucking M.A.F.I.A"
M.A.F.I.A by MCMXCV April 16, 2008