Green’s Dictionary of Slang

nosh n.

[nosh v.]

1. a delicatessen.

[UK]R. Fry letter 11 May in Letters (1972) II 411: Come with me to Kettners’ nosh at 8.0 [OED].

2. food, esp. a snack.

[US]A. Kober My Dear Bella 49: ‘I’m oney taking a nosh, that’s all,’ said Jennie, hungrily eyeing the platter of salami. ‘Yeah, I know awready your noshing.’.
[US](con. 1920s) R. Barber Night They Raided Minsky’s (1968) 169: They brought [...] plenty of nosherei. The standard nosh, or snack, consisted of pickle, [and] a bagel.
[UK]R. Cook Crust on its Uppers 55: Indian nosh at a little gaff in Earl’s Court.
[UK]Sun. Times Mag. 12 Oct. 32: So we goes along, and has a nosh, watching this garbage.
[UK]‘Derek Raymond’ He Died with His Eyes Open 75: C’n I go on with my nosh? ’m on shift at two.
[US]S. Morgan Homeboy 295: Tell that dingbat maitre d’ to shlep over the sweet nosh wagon.
[UK]Dandy 18 Sept. n.p.: Get rid of your mum’s nasty nosh.
[UK]M. Coles More Bible in Cockney 137: They’d all had a good nosh.
[US]Mad mag. Apr. 31: Would you folks like a nosh?
[UK]K. Richards Life 524: I cook [...] bangers and mash [...] or some other basic of English nosh.

3. in attrib. use of sense 1.

[US]J. Stahl OG Dad 92: [I'm] surveying the varying nosh techniques of everyone from Macy Gray (dainty) [...] to Tim Roth (laid back).

4. an act of fellatio.

[UK]K. Sampson Awaydays 78: Sonia gets down and starts to suck me. A nosh from the Nosh Queen.
[UK]K. Sampson Outlaws (ms.) 74: Watch a film with them, get over The Montrose, just get a nosh or something and still be back before midnight.
[UK]B. Hare Urban Grimshaw 31: Last week they had a National Blowjob Day and everyone on the patch got a nosh.

In compounds

nosh-up (n.)

(also nosh) a feast; a meal.

[UK]F. Norman in Encounter Nov. in Norman’s London (1969) 52: The first thing [...] you are going to do when you get out of the nick is get yourself a dirty great nosh-up somewhere.
[UK]E. Bond Saved Scene x: I’m goin’ to have the biggest nosh-up a me life.
[UK](con. 1940–50s) Nicholson & Smith Spend, Spend, Spend (1978) 31: All the money that we made carolling went on having a good nosh up at Christmas.
[UK]Barltrop & Wolveridge Muvver Tongue 20: In recent years younger people have adopted ‘nosh’, and a meal is a ‘nosh-up’.
[UK]I. Welsh Filth 38: I’ll give the auld doll this: she always made a good nosh-up.
[Aus]R.G. Barrett Mud Crab Boogie (2013) [ebook] They’re all leaving soon to find a cheap nosh.