40 mike-mike

noun

Any weapon firing a 40mm grenade. Often specifically the M203 grenade launcher, mounted underneath an M-16 or its variant. In the Marine Corps, often the Mark-19 Automatic 40mm Grenade Launcher.

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Meanings

noun40 mike-mike (plural 40 mike-mikes)

plural 40 mike-mikes

  1. slangUS Army and MarinesgovernmentAny weapon firing a 40mm grenade. Often specifically the M203 grenade launcher, mounted underneath an M-16 or its variant. In the Marine Corps, often the Mark-19 Automatic 40mm Grenade Launcher.

Origin

From Mike (“the letter M in the ICAO spelling alphabet”).

Full word history & related roots →
Cite this entry
APA

40 mike-mike. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/40%20mike-mike

MLA

“40 mike-mike.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/40%20mike-mike. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “40 mike-mike,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/40%20mike-mike.

Source: 40 mike-mike on Wiktionary, CC BY-SA 4.0.