a person who is not well educated and does not want to get any knowledge, so that s/he usually does not know anything, even the obvious things, and if asked, answers uncredibly silly.

sometimes used: "dumb like a Yank".
A: What's Queen of England's name?
B: Victoria.
A: You're dumb like an American.

A: Who's the president od Russia?
B: Lenin.
A: Dumb like an American!

A: Where lies Israel?
B: South America.
A: Youre dumb like an american.
by Krzysiek October 16, 2006
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