| Abbreviation | Definition |
|---|---|
| GM | Generally Meaningless |
| GM | Get Mechanic |
| GM | Government Modified |
| GMA | Golden Mouse Awards |
| GMB | Green Man Book |
| GMC | Garage Man's Companion |
| GMC | Gay Man's Cadillac |
| GMC | Gay Man's Cruiser |
| GMC | General Motor Cough |
| GMC | Generally date My Cousin |
| GMC | Generally Mediocre Cars |
| GMC | Generic Made Chevy |
| GMC | Genetically Modified Carrot |
| GMC | German Milk Cow |
| GMC | Get Me Crusher |
| GMC | Get More Cash |
| GMC | Get More Chicks |
| GMC | Gets Mechanics Crazy |
| GMC | Giant Mechanical Car |
| GMC | Giant Metal Chickens |