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8.
BSF
Butt-Sex Friday, a time-honored tradition started originally as a joke in the CU that has grown into a near ritual. Simply put, Fridays are set aside for buttsex, feigned or real, and anal activity is less frowned upon.
Cam and Udara had mad BSF last week-Zhe
by Fbook Masta August 12, 2006
 
9.
BSF
How low do you hang?
Ball Sag Factor
How's the BSF today?
by FactRzerO August 01, 2003
 
10.
BSF
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
 
11.
BSF
inshort, best stranger forever.
bobo, at&t, and deedee are my bsfs!
by urnecksmeller(= June 18, 2008