I'll be a son of a Siberian sea sucking sunfish

A wild old phrase that means you're so shocked you could swear the devil himself just bit your toe.

I'll be a son of a Siberian sea sucking sunfish if that pizza was free.

You just told my mom I was a bad kid. I'll be a son of a Siberian sea sucking sunfish.

I saw a goat wear a hat. I'll be a son of a Siberian sea sucking sunfish.