gadhero - A gadhero is a donkey who thinks it's a king. People use it

A gadhero is a donkey who thinks it's a king. People use it to call someone a stupid donkey who doesn't know their place.

You're a full-grown man and you still can't tie your shoes? You're a gadhero.

I told my boss he was a gadhero. He fired me. I won.

My dog called me a gadhero. I let him live.