An acquaintance who you are fondly referring to, but you don't actually know this person very well, nor is he or she your friend.

Derived from Senator John McCain's frequent use of the phrase "My friends..." on the presidential campaign trail directed toward a large crowd of strangers. Strangers he was fond of, yes, but strangers nonetheless.
Christine: My friend from my huge college class and I were working together and she said...
Michelle: Wait, what was her name?
Christine: I don't remember.
Michelle: And she's your friend?
Christine: Uhh...
Michelle: So she's your John McCain Friend.
Christine: Yeah, that's a good way to put it.
by McCainFTW March 6, 2009