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Slut That I Fuck Occasionally

An acronym to be used in the place of "friend with benefits" or "fuck buddy". This is somebody that you have sex with on occasion but that you also cannot stand. She will come over, fuck you, and then leave.
"I just need to get laid, can I borrow your STIFO for the night?"

"Dude, I think I need to get myself checked. I didn't wrap it last time I was with STIFO"
by The Late J.C. February 04, 2010
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