9 toes down is when your commitment is at a 100% and confirmed, but if you happen to flake at last minute you cannot get mad at the person who gave you the 9 toes down.
Chris: Hey Ronald McMoney?

McMoney: sup?
Chris: you swear you showin' to my party this saturday got a lot of babes coming.
McMoney: yeah bro! I'm 9 toes down.
by Old School Runescape Player September 17, 2017
Get the 9 toes down mug.