SMG 

Son of a Motherless Goat

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

SMG by OTGOGs December 8, 2020

smg 

shaking my genitals

bro these kids smg

smg by manmannam February 26, 2021

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 by Bait box July 1, 2022

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.

SMG by vicious11 January 8, 2010

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.

SMG by The urbster September 15, 2010

SMG 

Shaking my goods

Did you see me SMG out there?

SMG by Mark Abbott October 5, 2021

Smg 

“suck me good”

Guy: I just need you to SMG and then leave afterwards

Girl: What’s SMG?

Guy: Suck me good!

Girl: ok, I can do that

Smg by BetterThanYourVibrator April 25, 2019