unf 

The profound noise and/or actions of having wild sex.

unF unF unF unF..ohhh baby...

unf by Caitlin April 6, 2003

unf 

Universal Noise of Fucking.

Man, thewisepickle is the true definition of unf!

unf by CockWranglerOmgggg September 18, 2011

UNF 

For all of you vulgar people it can also mean the abbreviation for Unified National Fine (as in thread of a mechanical device that has a spiral groove cut in it for holding and fastening things together, most times called a "screw" that has no connotations to vulgarity.

When purchasing screws be sure to specify the thread type UNF as opposed to UNC

UNF by 1ofmanytoo July 12, 2011

unf 

the united negro fund

a fund for negroes that unite

i gave to the unf the other day, 20 dolla
i was watchin' white chicks and they referenced the unf

unf by gretchen69me January 1, 2012

unF 

The paradigm of sexiness.

Sabu is fucking unF

unF by Uru January 29, 2004

unf 

unidentified nocturnal fornication

unf was heard from the dark trees behind my house...unf unf...i was scared

unf by fireball4u January 4, 2005

unf 

The sound of dry humping an inanimate object while clothed.

unf by Krizzyn January 23, 2003