An FI is an an abbreviation for Fucking Idiot. You see these driving on the roads every fucking day. You can also find them in the workplace, in stores, and health clubs, police departments, and yes hospitals too. Most of them are men, but some are women.
That FI cut me off!
by Non FI May 29, 2014
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1)Five

please see fo, fo mo info.
what's his phone number? fo-fo-fi-fo-fo-fi-fo (445-4454)
by futuretrucker January 24, 2005
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A sock or towel used in jacking off to eliminate hand to penis contact. Normally found in bunks in jail cells, boy scout camps, and tour bus bunks. They should always be handled with gloves or a stick due to the nature of the goo they normally contain.
Why are there socks in all the bunks? Don't touch them, they're fi-fi bags!
by twistednick December 28, 2009
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fire fighters; fire engine; sound of fire alarm
Dude, what's that siren? I smell smoke... It's the FI-FI!
by fifithomas February 13, 2015
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when a person has to fart and pee at the same time.
Holy Shit, i hav yo Fis so dam bad.
by ASs..Holee December 25, 2004
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Basic white girl #1: Comment below for an FI!
Basic white girl #2: Comment!!!!
Basic white girl #1: Omg you have always been my favorite person forever!
Basic white girl #2: Awwww
by TheLetterE July 31, 2017
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