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, aka, University of North Florida, is located in Jacksonville, FL. It is the best school not only in Florida, but the country. It has the newest buildings, best food, private and large dorms, and the best weather in the US. It is an honor to be accepted to unf. It is also college to the tannest and hottest girls and guys. ;) oh and it has a lazy river. and b.o.b. is performing for free next month. just another added bonus. and its five minutes from the beach, just sayin'

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

Urine and Feces.

Used for marking territory, mainly by jackals.

It means Ur No Fun , ahkay.

Also see: 'o-face'