When a friend asks what happened in class today because they weren't there, you replied "Didn't pay attention. NSFG."
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Not Safe For Gym.
An acronym widely used among gymsters when they happen to get nudes sent to them while they're no paining no gaining.
"Fuck, that dude snapped me his junk while I'm bulgar squatting! This is totally NSFG bro... I'm so upset."
An abbreviation for "Not Safe for Gamers".
"not to be NSFG, but..."