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Best sister/friends
When two best friends are so close that they consider themselves as sisters !
- Pauline and Catherine are really close!
- Yeah! They're BSF s :)
by foreveryounnng May 12, 2012
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Sep 6 Word of the Day
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Damn that was a steezy ass kickflip son!
by niggaliciouszor April 29, 2007
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2
A bsf means best friend usually, bsf can mean a best friend who is like a sibling to you or just a best friend
via giphy
by Your_Dictionary April 14, 2019
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3
When someone uses โ€œBsfโ€ in a text, it usually means bestfriend.
Girl 1: Heyyy Bsf

Girl 2: Hey, hows it goin bsf?
by RugRat-47 June 16, 2018
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5
"Bull Shit Foursome"
Four friends who often go out together on random crazy adventures and day trips.
Let's go out BSFing this weekend!
by Cindy5 January 24, 2009
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6
Someone who is a BOOB STARING FREAK. Usually straight guys.
"oh my gosh that chick has got a nice rack!"
"YOU BSF!"
by CoolerThanYou32197392183 January 23, 2009
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