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3.
Slang for "Money, Green & Gold".
"Hey, did you hear about that new music group? They're blowing up. They're gonna get a lot of that M.G.G soon."
by X-Maxn April 16, 2009
 
1.
The BEST girls grammar school in Kent, with many of the pupils having boyfriends at Oakwood Grammar or the posher boys school MGS.
The school is home to a wide mix of people:
-the few emos that people stay well away from
-the sluts who shouldn't even be at a grammar school
-the geeks who get upset if they get an A in a test
-the posh girls who walk around in UGGS, Jack wills, ralph lauren, etc. and messy hair.
The school is also home to a few eccentric teachers, such as the male teachers who dress up as women every Rag Week and thoroughly enjoy doing so.
The pupils are well-known in the area for their brown 'turd' uniform, and are likely to be even more so next year when the headmistress is introducing brown kilts.
'Haha, that girl must go to MGGS, she's wearing brown'
'That girl over there goes to MGGS - yeah, she's bound to, she's wearing glasses'
by A fellow pupil February 18, 2009
 
2.
mgg
Internet shorthand for Matthew Gray Gubler of Criminal Minds fame, often used on livejournal.

Occasionally written as em-gee-gee if the writer is feeling like a giggly fourteen year old girl.
In other news, MGG is a total GQMF.
by vive la insomnia February 27, 2010
 
4.
MGG
Mammary gland Gyration... the act of tittyfucking
MGG is the same as tittyfucking, just a better way of saying it
by sihir February 07, 2011