G
| "Gal-boy" | Term for an effeminate man or homosexual |
| "Gallinippers" | Insects or mosquitoes |
| "Ginned cotton" | Flower bread |
| "Give the cold shoulder" | Serving someone the shoulder of an animal cold to suggest that the house guest had over-extended his/her welcome |
| "Giving the vermin a parole" | Throwing away clothes infected with lice |
| "Going down the line" | Paying a visit to a brothel |
| "Goober grabbers" | Term for Georgia troops |
| "Goober peas" | Peanuts |
| "Goobers" | Peanuts |
| "Gravel" | Condition caused by lack of green vegetables |
| "Greenbacks" | Money |
| "Greenhorn" | Officer |
| "Grey back" | Term used by Northern troops for Confederates meaning lice |