Green’s Dictionary of Slang

guttered adj.

very drunk.

1992		I. Rankin Strip Jack 155: Drove back about four in the morning. Absolutely guttered, but there was nobody about on the roads for me to be a menace to.
1993		I. Welsh Trainspotting 175: Tommy came intae the pub, follayed by Second Prize, whae wis guttered.
2009		Berkshire Eagle (Pittsfield, MA) 1 Nov. 29/1: You can’t hold a good Scotsman back when he wants to get [...] buckled, fou, guttered, [...] mortal, pie-eyed [...] plastered [...] steaming, stocious or wrecked.