What is Double Shit?
1.
When you take a shit, then 15 minutes later you need to take another shit.
Me: Awww man i just had to take a double shit
You: Wow...
See
2.
A term worse than shit when you can think of no other words more appropriate beacause of the desperateness of the situation.
Bridget Jones: "Shit......double shit!"
See