1900-2000Chinesegonghe, from jongguo gongye hozo she ‘Chinese Industrial Cooperatives Society’, used as a battle cry (meaning "work together") by U.S. soldiers in World War II
Examples
EXAMPLES FROM OTHER DICTIONARIES
Baxter is a gung-ho supporter of Senator Thompson.
very eager to do something dangerous or violent: The sporting opportunities here should suit the most gung-ho of tourists.