What does the idiom Popped his cork mean?

The idiom "popped his cork" means to lose one's temper suddenly and violently, often in a way that seems exaggerated or out of proportion to the situation.

Imagine a bottle of champagne: when the cork pops, it releases a sudden burst of pressure and energy. Similarly, someone who "pops their cork" lets loose a sudden and forceful outburst of emotion.

Example: "When I told him he couldn't borrow the car, he popped his cork and started yelling at me."