Side best friend

The person you call you best friend when your real best friend is no where to be found

Tyler is Alexis's side best friend when she can't find Maura

by Mojo9599 November 13, 2015

best friends on the side

The act of a subset of people from a group of mutual friends engaging in a side friendship.

Also shortened to "BFOTS"

"Oh so y'all hung out last night without ME? Talk about Best Friends on the Side!"

"Wait where was my invite when yall was BFOTSing?"

by Kassieme July 9, 2015