Retardation Factor; the ability to fuck everything up
Spencer was constantly watchin hentai, thus he is an RF.
by Warren Sapp November 03, 2003
Top Definition
Rape Fest

The #2 answer to all the questions.
ArmoHater: Hey, what are we going to do after school?
Brasil: RF, with John in the middle.
ArmoHater: Filling my head with lies!
by BrasilStyle April 25, 2009
rf or :rf:

red face.
A shy smilies shortcut from one of the Malaysia Largest Community Forum.
It became famous after most of the forumer love to add the smilies after every sentences/messages.

Sometimes it don't even means shy, the forumers just used it put rf at the back of their message.

Also widely use in Facebook by those forumers.
Are you ok? rf
Walao I just kissed a girl ! rf
Haha rf
by Malaysia Cari Forumers January 28, 2011
Rat Fink. A vulgar rat who hangs onto his own tail.

A screw-up.

A prank played against someone else.
Herman played a great RF on Mr. Heinkel.
by Cap'n Bullmoose April 23, 2005
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