Top Definition
A term used on tumblr and other sites usually posted in conjunction with a picture of attractive people/persons maintainer of said site would have no qualms fucking
Person 1: I'm going to post a picture of some cute hipster chick on tumblr! what should I tag it as?

Person 2: why not use unfff?
by whatnotery August 19, 2011
1 more definition
Scientifically proven sound a man makes when kicked in the testes.

Innocent bystander: OH SHI--UNFFF.

-Graphic Image-
by The Captain Falcon in example. September 27, 2010

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