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1 definition by
The real urban
Top Definition
BSF
Butt sex friend.
A friend you have butt sex with. Could be male or female. That is my BSF.
by
The real urban
December 20, 2017
Buy a
BSF
mug!
© 1999-2021 Urban Dictionary ®
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© 1999-2021 Urban Dictionary ®
advertise
terms of service
privacy
dmca
remove
help
