A plan that is evil. Period.

Then again, it depends on what your definition of 'Evil' is. And if you had a plan to commit that Evil.

For example:
Destroying the world is Evil. If you planned HOW you were going to destroy it, the plan would be Evil. Not because it destroyed the world itself, but because it told you how.
Im not very good at this explaining thing, am I?

This is a sarcastic comment about someone planning something which others may question.

It is a sentence that villains or supervillans use when their evil plan is coming into effect (kinda self explanatory don't you think?) Usually used with Muahhahahaha