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a person that doesn't practice oral hygene on a daily basis; one that lets teeth go bad to the point that they show signs of falling out due to poor maintance; having a breath foul enough as if one hasn't maintain oral hygene in a period of time.
person 1: I can't believe it...
person 2: what?
person 1: I had to leave that restaurant cause the waiter had rottenmouth...I was afraid to get my food and find parts of his teeth in it.

by looney leon November 12, 2006
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