The Billy and Mandy Tattoo is a popular tattoo design featuring two characters from the Cartoon Network comedy series, The Grim Adventures of Billy & Mandy. The tattoo consists of a cartoon version of Billy, wearing his trademark blue hat, and his best friend and sidekick, an anthropomorphic orange monster named Mandy. Together they are shown in a humorous pose, often with Mandy holding up a bowl of candy. The tattoo may also include other elements from the show, such as Grim and various supporting characters.