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1.
RLF
RLF stands for "Real Life Friend." This differentiates people you know in real life versus people you know via the internet.
I have been spending most of my time chatting with my AOL friends that I miss spending time with my RLFs.
by Jillian J. July 14, 2008
 
2.
RLF
another lovely internet shorthand stands for "Run Like Fuck"
There after us we better rlf!
by Ezraic October 03, 2006
 
3.
rlf
a short version of 'real life'
In rlf he wouldn't act like he did in this game.
by Martiine March 22, 2007