40 mike-mike
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
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.
Register: slang
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “40 mike-mike” mean?
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.
Is “40 mike-mike” formal or informal?
40 mike-mike is generally slang.