exhausted, very tired
used to describe, ones self, or someone else when they are physically or mentally exhausted
'when i got to the top of Mt. Everast I was knackered as a salmon'
'i had to stay up for 3 days straight, now im knackered as a salmon'
Tired, worn out etc
Knackered as a salmon when extremly tired
I've just been running from the pigs, now im knackered as a fish
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