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A mermaid tail is what you get when you're born with a tail or you're a dumbass who thinks wearing one makes you cool. Some people, like Texans, claim they have one and act like they're mad or high all the time.
My cousin says she has a mermaid tail. She's been talking to fish since she was 10.
My neighbor thinks she's a mermaid because she wears a tail to the grocery store.
My dog thinks I have a mermaid tail. He barks at me every time I wear it.