Best slutty friend- The friend of an ex-slut has from her 'wild years', who unashamedly knows all of her dirty secrets, and more often than not was present for some of them.

The BSF will of course have shared at least one, if not two (and sometimes at the same time) boyfriends or lovers of the subject.

Whilst the subject does her best to hide her past the BSF loves nothing better than to loudly discuss her current and future sexual conquests in front of anyone who will hear.

The BSF of course must naturally do her best to either break her friends relationship so she can bring her back into the slutty fold, or be apathetic about a break up and never encourager her friend to actually try and make something of her life.

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.

A best friend a really good friend,her name has to be kenzi because they are the best best friends ever!

inshort, best stranger forever.

Butt sex friend.

Bsf Are friends that are supposed to be for forever they supposed to be happy and silly when there around each other Thee supposed to go through ups and downs together when they argue they just joke it off at the end

Best shitty friends