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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
smg by Leandro October 30, 2004
Related Words
smg smg4 smgh Smg3 smgdh SMGWgamez SMG BITCH Smg Dump SMG Gun smg0
"yo man did you see SMG tonght, she had sooo much swag"
smg by Mayhem Swag December 5, 2011
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!
SMG by PURE FUCKING ANGER December 14, 2010
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
SMG by Billnye2 August 15, 2011
Acronym for "suck my genitials". Assosiated with sex, sucking a man's penis.
smg by MLP:FiM FTW! October 28, 2012
The highly talented actress, Sarah Michelle Gellar. She starred in the groundbreaking television show Buffy the Vampire Slayer which changed drama forever.
What's the new SMG movie out called?

You're as cute as SMG
smg by Divine Proportion June 13, 2005