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Definition of 40 mike-mike
1. Noun. (US _ Army and Marines military slang) Any weapon firing a 40mm grenade. Often specifically the w:M203 grenade launcher M203 grenade launcher whether mounted underneath an M-16 or variant. Often in the Marine Corps, the "40 Mike-Mike" is slang for the '''Mark-19 Automatic 40mm Grenade Launcher'''. ¹
¹ Source: wiktionary.com