A grom or gremmie, which is short for grommet, is a young surfer that’s about 16 years old or younger. Some people say grom is used to refer to a new surfer, but I’ve never heard it used in that context. It’s just a kid who surfs. There are plenty of groms who absolutely shred, especially where I live near San Clemente.
There’s a lot of theories about where the term originated floating around the internet, but I won’t bore you with them. The important thing is groms are child surfers. Though you may also heard kids who skateboard, snowboard, or ski referred to as groms.
The image below shows a grom surfing better than I probably ever will:
Check out my surf glossary for more surf jargon definitions.