"Mas" is Spanish for much, "Deuces" is latin for 2 but in the modern age has been used to symbolize the two finger peace sign hence, "deuces" for the two fingers. Usually used together as a farewell statement to close friends. Literally means, "much peace".
Speaker 1: "It been fun, see you tomorrow!"
Speaker 2: "Okay, mas deuces!"( Holds up peace sign after farewell handshake)
Speaker1: "Mas Deuces, homie." (Holds up peace sign after farewell handshake.)
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Army slang for the Browning M2-HB .50-caliber heavy machine gun
"Go grab me a couple of boxes of fifty-cal. I'm gonna make the Ma Deuce sing!"
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Ma Deuce is on the Loose is military slang, for the effective use of a M-2 .50 heavy machine gun in combat.
The sappers try to cut the perimeter wire, but they get cut down when Ma Deuce is on the Loose!