A by-product produced by mostly old people who wear diapers, as well as babies. The shit biscuit is formed when they shit themselves, but doesn't clean up or get changed right away. Over time, the turd is flattened out (from sitting on it) and eventually hardens into a dried out biscuit or cookie-like turd.
1. A confectionary given to your enemys, consisting of:
Shit + Biscuits.
2. A curse for when "Oh FUCK!" just isn't enough.
1. I really hate that brian-face, I know what I'm going to bake him, shit! and biscuits! Shit-biscuits!
2. Oh Shit-biscuits! (realising youve forgotten to wear clothes whilst in the middle of a flight to Ibeza)