Green’s Dictionary of Slang

sloshed adj.

also shlossed, slozzo, soshed
[slosh n.1 (1) + slosh v.2 (1)]

drunk.

[US]Minneapolis Jrnl (MN) 29 Mar. 11/4: he comes wadin’ up the aisle a-swining his arm and singinn’ like a soshed [sic] Scotchman.
[UK]S.E. White Rules of the Game 102: ‘Drunk, eh?’ ‘Spifflicated, pie-eyed, loaded, sloshed.’.
[Aus]Bulletin (Sydney) 12 Nov. 44/2: Well, don’t you think it’s the height of folly to allow yourself to get ‘sloshed’ with all that money on you?
[US]O.O. McIntyre 8 June [synd. col.] No one seems to know just how many verses there are to the jovial and ribald ditty. But one singer in West 48th street is able to sing 137 verses. And that, no matter how sloshed you are, is almost enough’.
[UK]R. Llewellyn None But the Lonely Heart 341: I’m a belted earl, I am. Well, not so much belted as sloshed.
[US](con. 1943) A. Myrer Big War 151: You’re kind of slozzo.
[Can]M. Richler Apprenticeship of Duddy Kravitz (1964) 200: Was he sloshed?
[UK]F. Norman Guntz 133: I had it away back to my gaff more than a little sloshed.
[Aus]J. Wynnum I’m a Jack, All Right 8: Get sloshed tonight, for tomorrow you may go to sea.
[US]C. McFadden Serial 105: I know you’re really in the pits, but getting sloshed isn’t gonna help.
[Aus]B. Robinson Aussie Bull 23: [H]e’d escaped to the pub and got sloshed.
[US]‘Joe Bob Briggs’ Joe Bob Goes to the Drive-In 131: I was sloshed on Bud, my regular brand.
[UK]K. Sampson Awaydays 171: Sloshed out of our senses with hair o’ th’ dog Bloody Marys.
[UK]Indep. Rev. 29 Mar. 4: The MI6 agent [...] became sloshed in a bar.
[Ire]G. Coughlan Everyday Eng. and Sl. 🌐 Shlossed (a): very drunk.
[Aus]S. Maloney Something Fishy (2006) 70: The randy desperation which led me to crack on to a half-sloshed twenty-four-year-old.
[US]Eble Campus Sl. Nov.
[US]D.R. Pollock Devil All the Time 147: He had been down all week [...] and he felt the need to get good and sloshed.
[Aus](con. 1943) G.S. Manson Irish Fandango [ebook] The thickset man stood up quickly but unsteady; obviously well sloshed.
M. Forsyth Short History of Drunkenness 40: Egyptians were proud of their binge-drinking. There was no shame in getting sloshed.

In compounds

slosh sex (n.)

sexual intercourse at a time when one is very drunk.

[UK]Guardian 31 Jul. 18: She has what is called slosh sex.