- GI Joe is a slang name for someone who was or is in the military.
An example of GI Joe is what you might call your cousin who is in the Army.
GI Joe on the battlefield.
Slang any man in the U.S. armed forces; esp., an enlisted soldier in WWII
Origin of GI JoeG.I., origin, originally abbreviation, abbreviated ; from g(alvanized) i(ron), interpreted as g(overnment) i(ssue) + Joe