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1.
fif
Fif: means to plead the fifth amendment; to not tell something to someone else because of whatever circumstances.

In the superlative, fif can be written as "fizzif"
Example 1: Rick: "Tell me what happened last night with that hot chick!'
James: "fif"

Example 2: "I plead the fif!"

Example 3: "I can tell you that I plead the fizzif"
by Charlie Murphy June 10, 2004
 
2.
fif
In French (Eastern Canada), a " fif " is someone who's homosexual or acting like it.
Le féminin de "fif" est "five"
Sti qu'té fif !!!
Té five mon homme !!!
by laurent September 26, 2005
 
3.
fif
low-grade marijuana, shwag, middies, etc. "fifth" or "fifty" also acceptable.
"I don't have much money so let's split a bag of fif and roll the L. Be on the float before long"
by Yuri Dadinov October 05, 2011
 
4.
fif
short for 50 cent
-Have you seen 50's new video
-Yeah, fif is crazy
by bush_is_pussy January 13, 2011
 
5.
fif
The Fifth Amendment.
Uh, I plead the FiF.
by Red Impulse March 05, 2004
 
6.
F.IF = Fart Induced Fit. The mad flailing of arms and nose pinching that happens as soon as a fart is smelt by the person unfortunate enough to be in the room when somebody else farts.
Hey man I did the best fart the other day but my girlfriend had a total F.I.F.

or, on seeing someone's reaction to your fart you can say
"Don't F.I.F out on me now!"
by ruby_wednesday April 09, 2010
 
7.
This is a word used when someone else does something stupid. When the person does something stupid, you put your hand on his/her neck and slide it off fast, or if someone does something really stupid you give them an uber fifs, when you include some fingernail in your fifs and that makes it hurt a little.
That kid just hit his head on a plank of wood. Fifs on him
by Harry2317 November 24, 2007