look up any word, like fleek:
 
8.
F.I. means freshman immaturity , as freshmen in highschool have yet to overcome that mental barrier that makes them giggle at the mention of the word penis
YO look at that Lenny kid, he's full of F.I.
by Paullly Vizzle January 24, 2011
 
9.
fi
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
 
10.
FI
a acronym for fire, one that is the finest of the finest.
Damn, that gul there is the Fi.
by Pimptress March 12, 2003
 
11.
fi
it means "Forget it". that's all.
guy1 : wtf r u doing!?
guy2 : what?!
guy1 : fi
by kilgayne March 06, 2004
 
12.
FI
1. "Fuck It" Used in southern Louisiana to symbolize a drug using/ gang banging lifestyle.
I'm FI all the motha f*ckin time"
by Emetic March 06, 2005
 
13.
fi
Adjective, used to describe something of good quality or someone who is good in a particular area; derived from the word fire
Kaley: did you see that girl the other day on the softball team?
Justine: you mean when she hit that grand slam?
Kaley: yea she is straight fi
by celeste25 March 15, 2008
 
14.
FI
Formal Inspection
FI is in 2 days..hurry and clean your room
by LCP 4 life May 16, 2003