Mermaid Security Don't Mess With My Mermaid. This graphic is for daddies, fathers and dads who love the aquatic creature with the head and upper body of human and the tail of a fish that is famous in folklores. Awesome design on a mermaid themed party. Mermaid Daddy Funny Graphic Great Gifts Daddy Shirts from Daughter Dad Shirt from Daughter Funny Perfect Mer Dad Merdad Dont Mess with my mermaid Shirt ideal gifts for Mermaid Security Mens Boys for Mermaid Mommy and Daddy Shirt. This Mermaid Security item is designed by Mermaid Security Merdaddy Merman Daddy Apparel Co..