A person who is obviously weird, strange, and does retard-like things, but is a fully functional human being, or whatever species they are. Usually they are assholes, but they're usually enjoyable and funny.
Example 1)
*Gonzo screams "Dick Waterfall" in the middle of an instructional period*
Jessica: What is wrong with that man
Amber: I don't know, but he must be a pretty functional kind of retard.
Example 2)
*Actual disabled child walks by*
Jessica: He's probably not a very functional retard
Amber: Dude, that's my brother.
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