NSTF

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

NSTF

NOT STUPID TO FALL

FAKE GIRL - Im sorry.

Me - NSTF NOT STUPID TO FALL

by Lil2328jjjw October 7, 2018

NSTFS

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