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4.
A young or inexperienced surfer or skateboarder.

A possible etymology for the word may be from the Portuguese term 'grumete', meaning the lowest ranking person on board a naval ship - this word would have been used widely in South Africa in the period when surfing was becoming popular.
There are a lot of grommets surfing at the point today, dropping on on everyone.
by DavidBan January 23, 2011
 
1.
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.

It is frequently abbreviated to grom.
On a beach crowded with children: "Where did all the grommets come from?"
by Princess Bitch-Face June 05, 2006
 
2.
this word usually decribes a YOUNG surfer, skateborder,a grommet can be someone who you think is a hot surfer, maybe annoying or good at what they do(surf)!!!
look at that lil hot grommet go!!!
by cboyce November 09, 2005
 
3.
A metal eyelet, such as in a tarp, the thing your shoelaces pass through, etc.
The grommets tore out of this cheap tarp. Guess I'll have to go to the hardware store and get some replacement grommets, and possibly a grommet tool.
by throwaway9999999 September 30, 2013
 
5.
Grommet is a mythical animal used for college physics problems as a projectile. The rodent-like animal shows much curiosity in sciences and appears to demonstrate several humanistic qualities.

The animal is usually described as "The Grommet" although they appear in large bunches when required. Such groups are referred to as flocks due to their tendency to find themselves brought into existence only to be airborne. As such their species has evolved to be of a highly durable, impact resistance creature.

They also exhibit tendencies to wear crash helmets, Viking helmets, capes, and Santa suits.

Origin stems from misconception of the word "Grommet" and "Gerbil" during a student's physics quiz. Student did not find it amusing that a gerbil would be dropped from a tall and aloud to impact the ground, although concern for small animals was lost after be told that a "Grommet" was a small metal washer type object and not an animal.
On earth, the Grommet runs horizontally off a 6 meter cliff at 1.6 m/s, at what time will he land?

by Scotty Bones September 01, 2008
 
6.
young annoying rubbish skateboarder, rollerblader, surfer, snowboarder, (all snakeboarders) etc etc.
blaaaaaaad, get off the ramp ya grommet.
by blaaaaaaaad June 29, 2003
 
7.
A small child who remains at a skatepark all day and does not move from a particular radius.
Little Jimmy likes to stand on top of the pyramid all day, what a grommet
by onoma777 September 05, 2008