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Stf is an abbreviation for “stuff” usually used during texting
Dude 1: Hey man, do you have the poster board and other stf for our project?
Dude 2:Yeah! Don’t forget to bring the paint and other art stf.
STF or (Self Trap Fap) is when regular porn no longer turns you on and you turn yourself into a trap to take photos off and then later use as fap (masturbation) material
Yeah I’m into STF it’s better than a subscription
When you're taking a dump and your butt flexes forcing the poop to retract into your butthole causing the sensation of sandpaper going up your butt.
"Man I hate it when I have a sandy turd flex (STF) in the bathroom"