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Not Safe To Fuck

Pretty self-explanatory.
Angela has a bad case of the brown starfish, her asshole is NSTF.
by acablue January 19, 2009
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Written abbreviation for "No Shit, True Fucking Story." Commonly used by fighter pilots, often at the beginning of a story about an adventure or exciting event.
Entry in the doodler book.

"NSTFS, there we were..."
by DeX696969 April 24, 2016
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