a mermaid tail

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!