Green’s Dictionary of Slang

ruined, wrecked, exhausted.

1934		P. Allingham Cheapjack 188: ‘What about slippin’ up the apple and pears and gettin’ in feather? I’m just about charvered’ [...] Feather was short for ‘feather and flip’.
1937–84		Partridge DSUE.
1989		J. Morton Lowspeak.
2023		R. Milward Man-Eating Typewriter 4: The system left thoroughly smashed and charvered!