F.O.N 

Stands for 'Freak of Nature'

'My politics teacher is a right F.O.N'

F.O.N by lour0y January 18, 2009

F.O.N. 

Freak of Nature!

WOW! he was a total F.O.N.!!!!

F.O.N. by Bambilover February 17, 2009

F.O.N. 

F-freak
O-of
N-nature

(pronounced "fawn")

That girl is such a F.O.N.!!
fon f.o.n.] F.O.N.

F.O.N. by kaderkaderk April 15, 2011

F.O.N.C

Friend of no Cunt

Meaning exactly what it stands for - you are definatley not a friend of a cunt or a friend of anyone at all depending on where you are

Jeez that girl is nothing but a F.O.N.C

F.O.N.C by Bexstacy December 17, 2006

F.O.N.C

A FRIEND OF NO CUNT

KEITH IS A F.O.N.C

F.O.N.C by WANKTISSUE February 8, 2010

F.O.N.S. 

Future One Night Stand. To be immediately followed by a dual thumbs up while saying Arthur Fonzarelli's classic "Eyyyyyy..."

"See that little blonde over there? She's my F.O.N.S. Eyyyyyyyyy..."

F.O.N.S. by sakimoto33 August 21, 2011

F.O.N.F.I 

Fear Of Not Fitting In

mark: hey dude come to the party tonight
joseph: nah man, I have severe F.O.N.F.I

F.O.N.F.I by OJayy25 July 12, 2021