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er bai wu, pronounced AR-BUY-OO in Mandarin Chinese, is translated literally as the number 250 and is a slang term for a very, VERY stupid person. This is widely used in the Northeastern region of China and treated as a taboo with a great deal of superstition. The number is avoided whenever possible, if a buyer in a market is bargaining, he would offer 249 or 251 yuan for an item, but never 250 for risk of appearing foolish.
Every student in that friggin class is er bai wu.
by Edward Rice May 02, 2008
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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