What does STG mean?
Usually means "swear to god"
Other definitions of STG:
Swear to god, used in situations of exasperation or frustration, such as getting stuck in the mud in a 2-wheel drive vehicle.
Sub the Gamer
Security Threat Group, or a prison gang
A specific genre of shooting game
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How to use the term STG:
STG, if 45 gets reelected we're all screwed.
Bro why did you just litter? Go pick it up. STG that is some pathetic behavior.
More slang terms:
Sitting Behind the Computer, Naked
not at the minute