Green’s Dictionary of Slang

1. (orig. US) completely, e.g. clapped-out, drugged-out, stressed-out.

1954		in Don McKay Wild Wheels 95: Compared to the old guy’s junked out jalopy.
1986		P. Slabolepszy ‘Boo to the Moon’ in Mooi Street (1994) 118: Hell-out complicated, I suppose?
1989		M. Amis London Fields 248: Little did they know that the place they were about to burgle – the shop, and the flat above it – had already been burgled the week before: yes, and the week before that. And the week before that. It was all burgled out.
2000		N. Griffiths Grits 29: A couple uv gay blokes oo work in thuh Arts Centre [...] must be gettin fag-hagged out by er.
2010		K. Richards Life 4: We were planed out. We’d had a scary flight.

2. used with a number to denote uneven odds, e.g. three-out, three to one in a fight.

1998		R.G. Barrett Goodoo Goodoo 120: I couldn’t stand there and see you getting two-outed.
2006		B. Matthews Intractable [ebook] Peter was willing to fight each one separately but they four-outed him.