Definitions by J!M!

FOS

Word used to describe a person that quiet often doesnt tell the truth, or in other words is "full of shit"

Also known as a "Fossi"

Guy 1: "I once used a cat as a soccer ball"
Guy 2: "ahuh, you're FOS"

FOS by J!M! June 27, 2008

A person that is desperate enough, to go out with someone they met though facebook, without seeing them in person.

You little Facebook Bitch, look at her, Shes 47 with love handels.