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SMG

Acronym for Sub Machine Gun. It is commonly used in the game Halo 3 where it is one of the few duel-wieldable weapons. It features a high rate of fire especially when two are used. Keep in mind that it is a rather useless weapon when used alone. Aim to duel wield.Commonly it is pronounced "Smug" over X-Box live voice chat.
Player 1: Dude grab that SMG

Player 2: F*** yeah
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SMG

Spiritual Mafia Gang
Gang established by youth in Curacao which has alot to do with the real definition of Mafia; swagger, boldness, bravado etc etc
-Yo is that the SMG?
-Yes it is.
by SMG_#1 August 1, 2021
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smg

In the world of BMW autos, it means "sequential M gearbox"
The 2003 BMW M3 has SMG, which is arguably an improvement in the traditional 5 speed way of shifting
by Leandro October 30, 2004
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smg

"yo man did you see SMG tonght, she had sooo much swag"
by Mayhem Swag December 5, 2011
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SMG

An acronym for so much game.

When a man is wheelin' a lot of biddies (chicks) he has so much game: SMG.

Also if you're getting a lot of action, you have so much game: SMG.
Man 1: MAN! JOEL SIGGELKOW HAS SMG!

Man 2: LOL I KNOW! HES KNEES DEEP IN SMG! HES CRAWLIN' IN BIDDIES!
by PURE FUCKING ANGER December 14, 2010
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SMG

Exclamation:
shortened version of "slap my grandma"
used in place of "lol" to make you seem more "hip"
hahaa omg bro that's hilarious smg
by Billnye2 August 15, 2011
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Acronym for "suck my genitials". Assosiated with sex, sucking a man's penis.
by MLP:FiM FTW! October 28, 2012
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