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2.
GMM
Grown MAn Music Clique of Stat Quo, an up-and-coming Atlanta Native. As heard on Young Buck's ''Walk with Me''
GMM's My Muthafuckin Squad, Nigga
They Be Cuttin' Them Mo' Fuckin Checks Now,
I Ride Big Nigga, I Got My Thang Danglin Nigga
And I Gotta Big Thang Out My Balls, Ya Understand Me
Dre And Em'll Feel Ya Man, They Gotta Love Niggas
Let It Be Known That Oscar Defined GMM Music Before Anyone
by Oscar December 03, 2004
 
1.
GMM
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
 
3.
GMM
GMM=gorgor's muimui
by wileen November 10, 2003