Someone in a coffee club who drinks coffee when it suits them but only drinks tea when he or she doesn't want to make coffee for the rest of the group.
Emma was a fairweather coffee friend because she was unwilling to be a permanent member of the office coffee club but didn't hesitate to drink coffee from time to time.
If the challenged person does not complete the request/task that his or her friend has set forward, the friendship will cease to exist.
Person 1: "Hey punch yourself in the face."
Person 2: "No."
Person 1: "Friendship test"
Person 2: "Fine" Punch Person 1: "Good, if you had not done that you would have failed, and we would no longer be friends."
Another anonymous individual, as one punk band would put it, "drowning in the pools of other lives". Friend of bob is an utter loser, has few friends, is anti-social, is unattractive, is still a virgin, does not have a driving license (or a car), does not have a job, dropped out of college, has a small penis, wears duct taped shoes, and is 19.
I call myself friend of bob because I once knew this guy named bob who told me what the ninja was. I doubt you'll find my definition of it on this site, however...
A nickname for anyone you (or a friend) have titty fucked. You then refer to the individual as "T. F." and if she's like "What does that mean?" be like, "Ah, it means True Friend. You're a True Friend." Then she'll be all like "awww that's sweet," and let you titty fuck her again.
"Man, Angie is a True Friend."
"Are you serious? She's got like EEs! Way to go bro!"