flip one's lid
flip one's lid also flip one's wig {slang}
1. To lose one's temper.
When that pushy salesman came back Mom really flipped her lid.
Compare: BLOW A FUSE.
2. To lose your mind; become insane.
When he offered me three times the pay I was getting, I thought he had flipped his lid.
3. To become unreasonably enthusiastic.
She flipped her lid over a hat she saw in the store window.
He's flipped his lid over that new actress.
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Source: A Dictionary of American Idioms
