What it means
Used when someone starts acting irrational, overreacting, or talking absolute nonsense, like their brain's wandered off and left the script behind. You can say a person’s losing the plot, but also that a meeting, plan, or group chat has lost the plot when it all goes chaotic and stops making any sense. Usually cheeky, sometimes said with real concern.
Usage examples
"Our PM’s losing the plot, mate. He’s just fired off an all-caps email about the biscuit budget, CC’d his mum, and signed it Kind rage regards."
"The boss completely lost the plot when the printer jammed, started shouting at a machine like it could hear him."
"I have been awake since four, I am losing the plot here, can someone just hand me a coffee before I cry."
"You are losing the plot if you think I'm joining a 7am team-building hike on my day off."
"The whole WhatsApp chat lost the plot after one typo and now everyone's arguing about a chicken that doesn't exist."
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Where it comes from
It comes from film and theatre talk, where the plot is the story you’re meant to follow. By the late 20th century in British English, people started using it for someone or something going off the rails, getting irrational, or turning into a full-on mess that no longer makes sense.
Other ways to say it
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