| Abbreviation | Definition |
|---|---|
| GMC | Give Me Cash |
| GMC | Give Me Chance |
| GMC | Give Me Chlorpromazine |
| GMC | Glorified Made Chevy |
| GMC | God Made CGI |
| GMC | God Made Chevy |
| GMC | God Makes Chevies |
| GMC | God’s Meanest Chevy |
| GMC | God's Magnificent Creation |
| GMC | Gods Meanest Chevy |
| GMC | God's Mechanical Curse |
| GMC | Gonna Make Cars |
| GMC | Good Mexican Cars |
| GMC | Got a Mechanic Coming |
| GMC | Got More Crud |
| GMC | Great Mechanical Creation |
| GMC | Great Mistake Company |
| GMC | Great Motor Car |
| GMC | Great Mountain Climber |
| GMC | Grown Man Crying |