1
A loud, obnoxious shout you yell at someone when you're mad they cheated, lied, or backstabbed you. You say it right in their face and hope everyone around hears it.
I declare shenanagins! You stole my lunch money and lied about it!
I declare shenanagins! You cheated on the math test and I saw you!
I declare shenanagins! You told my crush I was a total dork!