Top Definition
A drumnbass community in Bulgaria. The most commercial people of the so called "underground". USUALLY it means Hard Marihuana Smokers United, but we love to say that it means Hodish li Mnogo Seriozno na Uchilishte, which in bulgarian means "Are you serious about your school?"
Those hmsu idiots have an fuckin SMS screen on every party.
It's so boring and disgusting!
by bro4e May 28, 2006

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