A set or collection of surfing and skateboarding maggotry. Usually, between the age of 10-20, hanging out on corners. With the attire of straight legged pants, backwards baseball caps, and surf-dude mentality. Extremely annoying.

Note: A Gromulus is the leader of a pack of gromulii.
We headed to the pier to surf but it was infested with gromulii
by TheSmilem8ker November 24, 2010

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