Green’s Dictionary of Slang

1. hungover.

1942

Hartlepool Mail 14 Aug. 2/3: The R.A.F. has developed a language all its own. [...] Pilots suffering from the morning-after feeling are ‘newted’.

2. drunk.

2001		D. Bryant All-Dayer [film script; Internet] We need a kicker. How about a round of tequila. I need to get back to being newted.
2003		Langford & Grant Earthdoom! 103: I’m pissed off with you staggering in here every afternoon at opening time, already [...] newted out of your skull.