Exhausted, very tired; covered with bushes (less common usage).
From 'bush' plus '-ed.' The tired meaning likely comes from 'bushed' as in 'lost in the bushes' (disoriented), evolving to mean worn out. Australian slang usage is particularly common.
Australian and New Zealand English use 'bushed' to mean tired because loggers working in the Australian bush would come out exhausted and disoriented—getting lost in the bush made you feel 'bushed'!
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