Top Definition
Stands for Medical marijuana.
MMJ=Medical marijuana but is actualy called Medical cannabis.
by Hymen June 26, 2006
A type of ammo. A cartridge alos known as 5.7 mm Johnson or 22 spitfire.
-I can't find ammo for my .22 Marlin riffle.
-Try 5.7 mmjs, are much easier to find.
by Carlso Arbersú September 26, 2007

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