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a mermaid tail is a tail of a mermaid, though some people (typically texans) refer to themselves as a mermaid tail or having possession of a mermaid tail. those with a mermaid tail, seem to be slightly or overly phsychotic.
me: did you here about that girl that found out her boyfriend was cheating on her but didn't care?

you: omfg... YES! that girl is such a mermaid tail!
by someone who seems crazy August 20, 2016
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