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.
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British: completely exhausted. Can also describe something broken beyond repair. "Knackered from the commute," "car is knackered," "back is knackered." Multipurpose but always negative.
When you've mentally flipped the switch to full survival settings and stopped pretending you're okay. Knackered mode isn't just tired — it's the deliberate acceptance that your body and brain have clocked out and every task now costs triple. You're operating on autopilot, replies are one word, caffeine stopped working hours ago, and the sofa has claimed you as a permanent resident. Used to announce, excuse, or commiserate the state of complete depletion with a knowing nod from anyone who's been there.
A step beyond ordinarily wrecked — mega knackered is what happens when regular exhaustion gets stacked on top of more exhaustion, until you've reached a level of tiredness that feels almost theatrical. You're not just tired, you're spectacularly, cosmically, almost impressively destroyed. The word mega adds an element of dark comedy, implying the speaker has somehow lapped the normal fatigue dial and ended up somewhere absurd. Used with a mixture of complaint and reluctant pride that you've achieved peak depletion.
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.