Universal Noise of Fucking. See above definition for onomatopoeic use as a sound itself.

Common word used on Tumblr when seeing a hot person.

A term used to express sexual desire

Universal noise of fucking. Also used to describe someone attractive.

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"

The noise that the Doom guy made when you tried to 'open' a wall like it was a door. uNF uNF

Same as, "blown". Origin: The sound a guy makes when he cums.