What is sk8er boi?

"Sk8er Boi" is a song by Canadian singer-songwriter Avril Lavigne, released as the second single from her debut album "Let Go" in 2002. The song tells the story of a young skater boy who is rejected by a girl from a wealthy family, only for her to realize her mistake years later when he becomes a successful musician. The song was a commercial success, reaching the top ten in multiple countries. It is often considered one of Lavigne's signature songs and has been performed at many of her live shows.