Unf

Common word used on Tumblr when seeing a hot person.

hot.
UNF

Unf

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."

Unf

A virginal, completely stupid onomatopoeia that teenage girls use to show that they are dry masturbating through their pants to photos of hot men online, mainly on Oh No They Didn't!.
Girls, if you find him truly hot, use the word SHLICK instead, it's sexier.

UNF he's hot

Unf

unf·
.v. unf, unfed,
To hump in excitment; to make weird facial expression.

1. can she.. hell ya... shes a great unf
2. unf on baby! unf on!
3. but you unfed
4. whos unf'n
5. keep on unfin' in the freeeeeee woooorld

Synonyms: Boh!, Fuck, Hump

unf unf

The sound of humping.

OMG, that chick is so hot! Unf! Unf!

unf unf unf

The universal noise of fucking.

Claire: I've been here the whole time.
Claire: unf unf unf

unf

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