General Motors. An auto manufacturer based in Detroit.
GM is the Microsoft of the auto industry.
by Qbert October 17, 2004
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Glamour muscles. Muscles that you work out that are only for looks - not for core strength.
From the show "it's always Sunny in Philadelphia" this is what Dennis called Mac's muscles - GM - Glamour Muscles - god dammit!

Dennis: Well, how the hell are you planning on getting in there, Mac?

Mac: Uh... you put me on the spot. First thing that comes to my head, scaling the façade. All right, I know I soured on that earlier, but I believe that is my mind telling me that I have it in me.

Dennis: Okay, I hate to tell you this, bro, but you do not have the core strength to scale the façade of Citizens Bank. You just don't.

Mac: What? I work out all the time!

Dennis: Yeah, but you only work out your glamour muscles, and you know it.

Mac: I work out my core.

Dennis: No, you do not work your core. You're totally arm-heavy. You're all bis and tris and everything else is just fat and-and ribs.

Mac: Bro, I can do way more push-ups than you, and that's like 16 different muscle groups, I think.

Dennis: That is beyond retarded, what you’re saying right now. edit
by Panther Pride August 31, 2010
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General Motors, one of the biggest companies in the automotive industry, owns many brands marketed in both US and overseas, including Chevy, Cadillac, Pontiac, Holden, Opel, Vauxhall, etc. A lot of Americans say that the GM cars there suck, but the main GM brand here in Australia, Holden is actually very good, their cars are fast, reliable, safe and comfortable.
This morning i went for a drive in my Holden Commodore, manufactured by GM in Australia
by Someone Else April 30, 2005
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1. A motor company called "general motors"
2. The General Manager of a company.
1. Did you see GM's new van? My mom wants one.
2. The GM doesn't like your work, if you don't get crackin' he's gonna' fire you!
by WaningMoon March 22, 2006
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GM stands for Get Money, not Good Morning
My GM stands for get money, but good morning though
by Dr. Demacion November 17, 2019
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