A word used in rare situations to make a person sound smart when said to an uneducated person. But it's a very risky word to use and can do the exact opposite if you're talking to someone who's actually got a brain.
Bob: The subatomical particles in this hamburger is astounding! I went to UC Harvard, so I'd know about these things.
Billy: *confused* ...yea, cool.
Henry: Bob, you're a fucking idiot.