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1.
clf
the chief gang in chad, derby. Standing for Chad Lads Forever.There are subgangs such as clfy they standing for youth, and clfj the j for junior. Enemies alvo.
Chad Lads Forever (clf)
by chadlad January 05, 2007
 
2.
CLF
Craigslist Flake. A person you decide to meet off of Craiglist that lied about their personal information in order to arrange a meeting or has set up numerous meetings but never shows up.
Markus: I was so horny this weekend I put an ad on Craigslist.

Friend: Anything?

Markus. Nothing but CLFs all weekend. I had more flakes than a box of cereal!
by SharpieMarker May 06, 2009
 
3.
CLF
First saw this back in the 90s on an Atari ST demo. It stands for "Cheat Like Fuck".
In some hyperthetical match against better opposition say:
a: How do we beat these guys?
b: We're gonna have to CLF!
by MarzAttax July 19, 2005