flip one's lid

idiomatic phrase

variants or chiefly US flip one's wig

informal

: to lose one's reason or composure

You can't just up and quit! Have you flipped your lid?

Grandpa's been just dying for something like this. If he saw it, he would just flip his lid.

—The Munsters

especially : to become very angry or enraged

His mother flipped her lid when she found out what a risk he'd taken.

You say after flipping his wig he calms down, reflects and apologizes. That's a good sign.

—David Eddie

Word History

First Known Use

1930, in the meaning defined above