1. A word used when the obvious is stated.
2. It is the sound that a mentally handicapped person makes.
3. A basic unit of measurement of human stupidity. One "duh" is a single unit of stupidity, for example, misplacing your keys would be approximately one duh.
1. 1+1=3, duh.
2.Billie's favorite noise to make is 'DUH!'
3. Liz Hovel is three duhs.
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