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.
To finger a girl on her period, (clunge being the ocean, body being the land) pull your fingers out an walk them up her body to her chest. Do a little jig with said fingers then ram them up her nose flapping around like a fish out of water!
when you spend a month on Thailand beach and your girl doesn't bother to shave her bikini-line or trim the quim.
So you go for a nude surf, after which fall on the sand and go down on her crispy, rough sand-jungle, giving your face a nasty rash as it digs into her furry mermaid.
"jeez SUN! what happened to yer face? looks like you've been doing serioustime on a furry mermaid!"