To suddenly become very angry, excited, or lose emotional control in a dramatic way. Often describes an unexpected or disproportionate reaction to a situation.
This phrase emerged in 1960s American slang, using 'flip' to suggest a sudden reversal or change of state, like flipping a switch or coin. The 'out' intensifies the meaning, suggesting someone has flipped beyond normal bounds. It may have connections to earlier expressions about 'flipping one's lid' or losing one's top.
The 'flip' metaphor is perfect for describing sudden emotional changes because it captures both the speed and the binary nature of the transition - you're either normal or flipped out, with little middle ground. It's also wonderfully visual, suggesting someone has literally turned upside down emotionally. The phrase treats emotional control like a light switch that can suddenly flip off.
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