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Universal Noise of Fucking. See above definition for onomatopoeic use as a sound itself.
by Video Warrior Laserion December 14, 2002
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sexual. Accronym for "Universersal Noise for Fucking"
particularly heard during intercouse when the female moans but bites her lip to silence herself. "unf" heard as "uuuuhhhfff" or "ooooouuuhhhnnnnnfff"
"all that bitch could say was unf"
by -GT February 15, 2006
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The noise that the Doom guy made when you tried to 'open' a wall like it was a door. uNF uNF
uNF uNF uNF uNF oh shit, this is a wall, not the door leading to the floating eyeball.
by dC//jANGEY June 11, 2003
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Same as, "blown". Origin: The sound a guy makes when he cums.
"Unf, I have that paper due in two hours and I haven't even started."
by Awesomenesssss213 March 05, 2012
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