The point at which exhaustion has reached its absolute ceiling — you cannot get more tired, your body has submitted a formal resignation, and your brain is basically screensaver mode. Peak knackered is used to signal you've hit the terminal level of depletion, often with a kind of bewildered disbelief that you are still functional at all. British slang speakers use 'peak' both as an intensifier and as a superlative marker, making this compound immediately readable as maximum tiredness without ambiguity.
I've been awake since four and just did a six-hour drive — I am peak knackered and cannot be held responsible for anything I say.
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Viral internet speak — memes, ratios, main-character moments, and the algospeak of every platform from Twitter to Reddit to TikTok comment sections.
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