Merguy

"I don't know. But he's still breathing, or whatever it is merguys do. We've got to try and revive him somehow," said Sabrina thoughtfully.

Step right up and see the merboy, merguy, merman. Where does his ding-dong go?

“Here, entertain yourself. I'm only expecting merguys to be at the meeting today, and there are no pictures of them.” Either the male mers didn't get out much or, more likely, men had written all the history books.