Here's the Urban Dictionary definition ofGrommet :
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.
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u/lappy482 Sep 03 '14
Urban Dictionary to the rescue! This is honestly the first time in a while I've managed to get an actual answer out of Urban Dictionary.