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1 definition by Zacwill

1) An old fashioned name for someone with down syndrome, originating from the belief that people with down syndrome resembled Mongolians.

2) An offensive term for someone who is idiotic or stupid. Often shortened to mongo or mong.
I'm afraid your son is a mongoloid.

You spilt coke on the carpet you mongo!
by Zacwill June 18, 2013