Surfer slang (although also extends to other boardsports, and surf sports) for a young surfer. Can also be used to refer to children in general, although usually they have some association with surfing/etc.
Although usually there is no ill-meaning behind the term, it is often used to poke fun at younger surfers. It can sometimes be used as a derogatory term when younger surfers are annoying, bad or otherwise difficult.
The area by the penis/vagina where huge amounts of hair grow and evolve while being unshaved. This is usually the result of a dirty, homely being. It would be similar of grabbing and running your hand through a brillo pad or a black mans nappy hair.