GMC 

Gay man's car

Person 1: ain't that a nice looking GMC
Person 2: soz I'm not gay

Person 1: why do u say that
Person 2: did u heard what GMC means, it means gay man's car

GMC by Dr.Snake53 April 24, 2018

gmc 

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!

gmc by String name="ProgrammerDude"; June 11, 2018

GMC 

Gay
Mans
Chariot

That queer is driving a GMC

GMC by luke_2008 January 22, 2009

GMC 

General Motors truck line structurally identical to Chevrolet trucks

real meaning: General Motors Company
owners meaning: Greatly Made Chevy

Pontiac for cheap cars
GMC for good trucks
Chevrolet for both

GMC by Geek-O-Man March 5, 2005

gmc 

means got me crackin. similar to lol

that guy just got hit by a car gmc

gmc by gmoney78944 March 27, 2020

GMC 

Gay
Moronic
Crap

GMC by FhillyMan October 20, 2003

gmc 

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.

gmc by Bart Hansen April 7, 2004