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When you overreact to a small setback with an exaggerated display of emotion that causes people to question your sanity, that's a Dean Scream.

Howard Dean was widely considered to be the front-runner in the 2004 primaries, but on the night of Iowa's caucus, it was obvious that he'd been beaten in part by John Kerry, and also by John Edwards and Dennis Kucinich(who were working together to get delegates - oopsy, John got more than Howard!) and in a bug-eyed rant, he attempted to cheer himself and his supporters up by telling them about all the other states they'd win in, and topping it off with a hysterical scream very much like a donkey braying(appropriately enough, Dean is a Democrat.) The jury was out for a while on whether he was screaming in joy or agony, but nevertheless, Dean was done after that.
"Damnit, there goes the bus. YEEAAAARGHHH!"

"What? I got an A-! This should have been an A+! I don't believe this! YEAAAARGHHH!"
by Laura Tobin June 04, 2004
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2
1. When you are running for president and you put millions of dollars into your campaign and blow it by screaming.

2. A strange and disturbing scream that is similar to that of a dinosaur.
1. Dean blew his shot with the Dean Scream.

2. He was so afraid he had a Dean Scream.
by Al "The Computer Guy" April 16, 2004
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