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A mix of the disabilities: "Retarded", "Down-Syndrome", and "Autistic" to make one super word made of all three. Only to be used when someone does or says something extremely "Redowntistic".
Mainly used as slang to describe someone really dumb. Not to make fun of the disability, but rather the person; Comparing them to the disability.
Man 1: "Hey man, what's Obama's last name?"
Man 2: "..How Redowntistic are you?"

Woman 1: "My sister is pregnant!"
Woman 1: "I can't wait to find out if I'm going to be an aunt or uncle!"
Woman 2: "Have you recently been diagnosed Redowntistic?"
by SwiftxVicious May 18, 2015
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