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Sandy Turd Flex (STF)
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"
by
Matt Stazjic
February 04, 2016
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Sandy Turd Flex (STF)
neck gaiter and mug.