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

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SMG

Stands for "slower than manual gearbox"

Often found in BMW E46 M3's in the era when BMW could not produce a proper gearbox

Person 1 : My E46 m3 has an SMG box

Person 2 :Oh that's a shame

SMG

Son of a Motherless Goat

SMG, that hurt! Son of a Motherless Goat, that hurt!

SMG

Smacking my gum. Derivative of SMH.

Used to express:
a) Oh, really?
b) Mhm. That sounds like crap.
c) I don't believe you.
d) Shut the hell up.

Person A: I totally got three million points on BrickBreaker yesterday.
Person B: SMG.

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SMG

a variation of suck my balls, this means Suck My Gonads. when used as a clan tag in cod (call of duty) it can be interchangeable with the term Sub-Machine Gun, for those of us who enjoy using weapons such as the p90 on xbox live.

SMG just pwned you with a p90, bahaha SMG.

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SMG

Shaking my goods

Did you see me SMG out there?

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SMG

An acronym for Sick Mack Game.

Man, Tim really has an SMG lately, he's hooking up with everyone.

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