A slag is a girl who gives head, free sex and loves attention from boys. E.g Libby she is pregnant at the age of 13 and she sucked dick at the age of 12 (how sad) her mum looks like a ugly fucker and they both should burn in hell
People: have u heard of that slag Libby who had sex at the age of 12!
Other people: yeah! Sheâs the biggest slag in Lewisham and she gives head for a living