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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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3
"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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4
The cliched phrase every guy tells to a girl when he wants her: Beautiful, Smart, and Funny.
Hey bro, did she say yes?
Nah, I did the BSF way too early
by Kukoo October 09, 2010
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7
"Bisexual Foursome"
Four friends who often go out together on random day trips together.
Hey, you guys want to come out on a BSF day out soon?
by loz333 March 20, 2008
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