When you are stuck on a difficult programming task and decide to take a break to make work collegues and yourself a tea. While fermenting the hot brown liquid you realise the solution.
Can often be a more delightful way of debugging.
Teabugging also be applied to other forms of problem solving.
It's no use, this .Net code is going to need a teabug. Hey - get your balls out of my face, I said a tea-BUG!