A person who not only owns the Vibram Fivefingers but wears them constantly.
A Vibram Whore tells everybody they know (and don't know) about the Fivefingers obsessively.
Any time somebody mentions anything possibly related to footwear, the Vibram Whore will quickly jump in to mention the benefits of the Vibram Fivefingers.
They can usually quote several studies offhand showing the benefits of running or walking barefoot.
Friend 1: Totally, man.. oh god. Here comes Colin.
Friend 2: He's such a Vibram Whore.
Colin: Hey, guys, want to hear the benefits of the Vibram Fivefingers?!
Friend 1 & 2: Christ..