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3.
Variation of starfucker; someone on Facebook who looks for famous or rich people with a Facebook profile to "add as friend"
Whut? How'd she get LeBron James and Paris Hilton as friends on Facebook?

Bitch, please. That girl is nothin' but a FriendFucker.
by Shab-Doo May 12, 2008
 
1.
IS A MAN OR WOMAN WHO FUCKS OR TRIES TO FUCK HIS OR HER MATES GOOD FRIENDS. 1 WHO TRIES TO FUCK BETWEEN GOODS FRIENDS.
JOHN IS TARAS BOYFRIEND! JOHN IS FUCKING AND TRYING TO FUCK TARAS FRIENDS. AND IF THE FRIEND IS A BIT BETTER LEAVES TARA FOR THE FRIEND. JOHN EVENTUALLY GOES BACK TO TARA. AND TRIES TO FUCK A DIFFRENT FRIEND! JOHN IS A FRIEND FUCKER!
by YUM49 December 15, 2008
 
2.
A good friend, homie, or pard that commits actions considered unfriendly, uncaring, and inconsiderate. Can be interpreted as a joke or warning to avoid bad friend behavior.
luke is a friend fucker, i got a ride with him to the park and he left me there with out letting me know.
by Lou Dumas!!!! November 09, 2010