I declare shenanagins
When you're so angry at someone's sneaky behavior that you yell it out like a war cry. It's like the ultimate insult and you're probably never going to talk to them again.
I declare shenanagins! You switched my coffee with hot soup and now I have a beard!
I declare shenanagins! You took my favorite video game and didn't even say sorry!
I declare shenanagins! You told my mom I was eating dirt for breakfast!