Top definition
The level of friendship that is almost unreachable. It far surpasses BFF or any other stupid name you can come up with

(short for best friend tongue face spelled out)
this slut is my BFTFSO damn shes lucky ;)
You are my bftfso i can talk to you about everything :)
by WAHHHHHHHH August 02, 2011
Get the mug
Get a bftfso mug for your mate Callisto.