Basically when your with your mate('s), and you want to tell him a fit girl is close without anyone knowing what your talking about you say "biscuit!".. your friend looks around and checks her out.. no one is any-the-wiser!
Male 2: "offt fuckinel!"
Also if you get gd at this you can start saying stuff like "viscount" (which as a green biscuit wrapper) so you would be looking for a girl with a green top on, but you could use "pink waffer", "blue ribbon" etc.. and just make your own up. as long as you both no the code u can be stood at the side of the girl who your talking about and she never knows.
works well when your in shopping centers! lol
oh yeah and "Borbon" is used to describe a fit black girl