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A word combination of the words "Dumbass" and "Mermaid". It is a person who possess mermaid qualities such as long hair, pale skin, etc, who is also completely clueless about life and has no common sense.
Girl 1: OMG, look at her, she looks like a mermaid.
Girl 2: i know, she's such a demermass!
by floridababe614 July 01, 2010