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1.
The term/command used in battle.net games such as starcraft, warcraft, or diablo in which someone is to remove(the r) someone from their friends list(the /f) which is capped at a maximum of 25 friends. This may be from the cause of inactivity of that friend, enraged at that friend, or just because he is a n00b.
ex 1:"Wow I hate beetis, he sucks at lost temple."
/F r Beetis

ex 2(RL Conditions):

"Omg Sally lost my eyeliner, that fucking bitch! /f r her ass, I don't like her"
by John November 29, 2007