Gun Motor Carriage
A type of military vehicle used mostly in WW2, that's lightly armored
and has a gun, that's useful as a support utility.
A self propelled artillery/AA gun/howitzer

Also used as other abbreviations, for example:
Genetically Modified Cabbage
Keep the GMCs behind the tanks!
The AAGMC in the convoy is there to provide mobile AA fire.
We need to dig in those GMCs before the counter attack or
they won't last long!
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means got me crackin. similar to lol
that guy just got hit by a car gmc
by gmoney78944 March 27, 2020
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Grandpa Motor Company. This truck is the truck you most often see in 2 wheel drive. The new Duramaxes are made for old men who like to drive their trucks once a month and never take them offroad. New GMCs dont have a solid front axle making them damn near offroad incapable.
Duramax is a great engine. Isuzu did a good job there. Fuck duramaxes i'll smoke any duramax in my ford 6.0 powerstroke.
by Bart Hansen April 7, 2004
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G-GAY
M-MAN'S
C-CHOICE
that fag is driving a gmc
by cdp1997 January 31, 2011
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GMC stands for Good Mood Club. It represents a feeling of joy or excitement which may be incited by any stimulus.
The sun has finally come out after a long winter. This is so GMC!
by sosodefxxx598 May 1, 2007
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A mid-size crossover SUV that really pulls some ass. Manufactured by General Motors Company, the Terrain destroys all other vehicles and makes them look silly with its awesome power and beautiful design. Dudes and ladies alike get laid constantly while cruising around in one of these bad boys.
"Just got a new GMC Terrain so it looks like I'm going to pound town tonight!"
by Southside_Rog November 21, 2013
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