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Short for Good Mythical Morning.
A daily internet talk show on youtube created and hosted by internetainers Rhett McLaughlin and Link Neal.
Usually including challenges, tests, "will it"s, facts, famous guests or sketches.
"Dude did you watch today's GMM?"

"Yeah man of course I did , It was a 'will it' episode."
by ella-smella-della-ding-dong April 01, 2016
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Sep 6 Word of the Day
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Damn that was a steezy ass kickflip son!
by niggaliciouszor April 29, 2007
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2
Good Mythical Morning. That show on YouTube with those two guys who do crazy ass shit for views.
Girl 1: Hey, you like GMM?
Girl 2: No, those guys suck dick for views
Girl 1: Bitch, I will cut you if you say that again
Girl 2: Runs away crying
by cyanidedreams December 29, 2015
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3
The hellish assignment given to students attending the Maine School of Science and Mathematics. It usually consists of eight or nine problems and requires many hours of useless work with 2 to 3 other people.
Margaret: Are you going to start working on our GMM?
Trevor: OH SHIT! That thing is such a bitch.
by Quigsley March 23, 2010
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5
Got me mad. Usually used in slang, for expressing the anger in which someone has caused.
by UrbanSlang12345 September 08, 2016
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6
GMM (granny mob massive) a gang of school girls that belittle you with their massive tits.
Granny Mob Massive was more than that. Rebecca and crew dem didn't like our silly boy behaviour in school and thought we were immature so we nicked named them like old granny's who don't like a laugh. So I had my first wank over the GMM.
by Jimbobwally July 25, 2019
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