Dahaneto
Dahaneto is your mouth when something hits you so hard it feels like your brain is doing a backflip.
I saw a cat wearing a hat. I said, 'Dahaneto!' and started laughing like a maniac.
My teacher said we have a pop quiz. I said, 'Dahaneto!' and hid under my desk.
I won the lottery. I said, 'Dahaneto!' and screamed so loud my dog ran away.