Green’s Dictionary of Slang

to fall asleep or collapse, whether through exhaustion or an excess of drink or drugs; thus gouch/gouch-out n., the state that follows heroin use.

1994		I. Welsh ‘A Smart Cunt’ in Acid House 222: If ye jist want tae gouch, it doesnae really matter.
1999		Scotland on Sun. mag. 7 Nov. 17: It made me sick all the time but it was being stoned and the gauching (totally relaxed, slumped forwards) I liked, the relaxed feeling through my entire body.
2000		J.J. Connolly Layer Cake 146: It’s fuckin sad and repulsive cos she’s half gouging, stinks of Tennant’s, snout and junkie constipation smell.
2000		M. Manning Get Your Cock Out 83: She was cool about his smack and was partial to the odd gouch-out session herself.
2005		B. Hare Urban Grimshaw vii: Gouch Dreamlike state induced by heroin use [...] 139: Just before the gouch came, I fancied I heard Lao Tzu whisper [etc.] 208: It hurt to see them [...] gouching, eyes half closed, tinfoil everywhere . . . smackheads.
2011		G. Knight Hood Rat 171: Some people buy Mannitol and gouch out, but that’s silly.
2020		G. Armstrong Young Team 80: Wee Broonie’s gouchinn A’m strokin the couch like a dug.