Green’s Dictionary of Slang

poss adj.

also pos
[abbr.]

possible.

[UK] in D’Urfey Pills to Purge Melancholy V 329: Drunk I was last Night that’s poss.
Marshall ‘The Dolls’ ‘Pomes’ from the Pink ’Un 24: While the public morals-shaper Thinks of writing to the paper To upset the show, if pos [F&H].
[UK]‘Doss Chiderdoss’ ‘The Rhyme of the Rusher’ in Sporting Times 29 Oct. n.p.: At the first big pub I resolved, if pos., / That I’d sample my lucky star.
[Aus]Euroa Advertiser (Vic.) 26 Apr. n.p.: What about the shortening of words, like ‘poss’ for possible?
[UK]Gem 4 Nov. 4: ‘Yaas, it’s quite poss.,’ he remarked.
[US]E. Pound letter 4 May in Paige (1971) 177: Will let you know as soon as pos.
[UK]Breton & Bevir Adventures of Mrs. May 180: You gotter make it pay. You got to get as much outer it as poss. if yer the top of the perfesh.
[UK]D. Bolster Roll On My Twelve 37: We’re going to have it patch up, if poss.
[Aus]D. Stivens Jimmy Brockett 168: I’ll pay, but you keep it down as low as poss.
[UK]J. Orton Diaries (1986) 28 July 259: We must get back there as soon as poss.
[NZ]R. Hall Glide Time 51: If you could get them along as soon as poss.
[UK]Guardian G2 16 Nov. 7: That’s why I vamoosed, quick as poss, and married John.
[UK]R. Milward Apples (2023) 1250: [I’d] get out of the relationship as quickly as poss.
[UK]J.J. Connolly Viva La Madness 210: ‘What shall I tell Sonny?’ ‘As little as poss’.

In phrases

no poss

(Aus.) a phr. used to denote the speaker’s denial of chance / opportunity.

[Aus]Brisbane Courier 29 May 6/3: They have ‘Buckley’s’, ‘no poss,’ or ‘no earthly’.