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.
by 1ofmanytoo July 12, 2011
by gretchen69me December 30, 2011
unidentified nocturnal fornication
by fireball4u January 05, 2005
Any sort of vigorous sexual intercourse. "Unf" being the sound one might make, as in;
"Unf unf unf..."
"Unf unf unf..."
Brian and his boyfriend were unfing in his car like the whole time; I only saw them at the end of the night.
by mini-taur March 06, 2016
by SirBox March 14, 2003