Highlighter Skin

Alright, listen up, buttercup. This "joke" is saying your skin is so shiny and bright, it could be used like a highlighter pen. You know, to mark important stuff in books because I know you read books. It's a compliment disguised as a roast! It's like saying you're so radiant you could light up a room, but less poetic. Basically, you are bright, but not in the smart way.