A derogatory slang term for a specific type of metal head that is extremely elitist, is rarely seen in places other than the internet, listens to doom metal, plays Dungeons and Dragons, World of Warcraft or engages in some other type of nerdy activity. A dumbis is usually fat and will dress in cargo shorts, skate shoes, and an Isis shirt. Dumbi rarely have long hair like other metal heads, instead opting for a long neck beard or slightly "shaggy" hair.
Comedian and actor Brian Posehn is a dumbis.
by BroUpBroDown February 8, 2011
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a slang term for a specific type of metal head, that is usually fat, nerdy and wears cargo shorts. Dumbi generally listen to sludge metal, and are very pretentious. They'll talk your ear off about Dungeons and Dragons too.
by blackmetaldumbis February 16, 2011
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One who is dumber than usual.
John is such a Dumbis, he lost his keys to his car.
by Scott Warshire August 16, 2007
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Someone, usually a friend, who does something unbelievably betraying or idiotic. Strong way of saying, "dummy."
Joe: You told Christine my deep, dark secret? You dumbi!!!
by Marzipanesque May 21, 2007
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Common misspelling of the word dummy, almost always used by the people who can easily be described by the word itself. Just because dumb has a "b" at the end, does not mean dummy has to. Also, dummy does not rhyme with Gumby.
"You are such a dumby!" -Lauren, Monica, etc...
"Actually, you are the dummy!" -Brandon
by Crunk Dizzle September 29, 2006
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a dumbass and a newbie to certain things
I'm such a dumbie at wood working
by Sheep March 20, 2004
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It must be pronounced with a hard "B"

Its definition is unspoken.
You are acting like such a dumby rn
by jumbojelly October 29, 2019
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