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A girl or young woman who enjoys being urinated on and/or urinating on herself; it is a combination of the word "piddle" meaning to pee and the Disney film "The Little Mermaid."
1) Ariel loved having other people pee on her so much, they started calling her "The Piddle Mermaid."

2) I walked in on my little sister the other day and she was lying in the tub peeing all over herself...she's such a Piddle Mermaid.
by ED1071 April 15, 2008