The Merlin's Sleeve is a certain, and not uncommon 'breed' of female genetelia, commonly found in the Middle Eastern region. The Merlin's Sleeve is the complete opposite of a "Camel Toe" and refers to a female's vagina with a protruding, saggy Labia.
Named after it's uncanny resemblance to the sleeve of Merlin the wizard's robe. Merlin's sleeve is uncommon amongst females under the age of 14.
Person 1: "I could tell i wasn't her first"
Person 2: "how so?"
Person 1: "she had merlin's sleeve mate"
Guy 1: "I finally got off her underwear only to realize Merlin had left me a gift."