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1 definition by ShadowForm

1: (n) Any government agent, or specifically an FBI agent. Term originates from "Machine Gun" Kelly, who used it to address the FBI agents sent to arrest him in Memphis.
2: A character in the Half-Life game series.
1: "Don't shoot, G-Men!"

2: You see him several times in the game, but G Man is immortal. Don't waste your ammo.
by ShadowForm February 07, 2006