Green’s Dictionary of Slang

nosh v.

also knosh, nash
[Yid. nosh, to snack and Ger. naschen, to nibble, to eat surreptitiously; mainly US but note The Nosh Bar, a long lived delicatessen/cafe in Great Windmill Street, Soho, London]

1. to eat, esp. to snack, to eat between meals; occas. to drink.

[UK]Sporting Times 24 Apr. 6/2: She’s a makin’ a matsa kelise puddin’, / (I wish I was noshin a bit).
[US]G. Berg Rise of the Goldbergs 117: You’ll get maybe two but you shouldn’t nash* from de bag on devay home. *Nibble; sample.
[US]N.Y. Herald Trib. 28 Feb. 11/6: It will last for two hours while the drinker ‘schmoozes and nashes’ down $1 worth of ham free.
[UK]Galton & Simpson ‘The Reunion Party’ Hancock’s Half-Hour [TV script] Stone me, he used to nosh like nobody’s business in the Army.
[UK]A. Burgess Enderby Outside in Complete Enderby (2002) 343: Anyone noshing in there? [...] His head twitched towards the dining-room.
[US]R. Price Ladies’ Man (1985) 153: I started getting hungry and brought in the salad bowl so we could nosh.
[US]Eble Campus Sl. Mar. 5: knosh – to snack.
[UK]S. Berkoff West in Decadence and Other Plays (1985) 93: Mum’s left chicken soup for you to nosh.
[US](con. early 1950s) J. Ellroy L.A. Confidential 294: He’d rather nosh grease at Kikey’s fucking deli.
[UK]M. Coles Bible in Cockney 88: When they all had nothing left to nosh, Jesus [...] said, ‘I feel sorry for this lot’.
[US](con. 1960s) J. Ellroy Blood’s a Rover 25: Phil was hunkered down to mosh.

2. to practise oral sex [pun on sense 1].

[US]B. Rodgers Queens’ Vernacular 142: nosh [...] 2. (fr Yid noshen = to nibble between meals) to suck cock.
[US]H. Selby Jr Requiem for a Dream (1987) 10: I like to knosh. A little chopped liver, a little smoked fish.
[UK]K. Sampson Awaydays 45: I know them vaguely from Rupert’s, where they’ve got a bit of a rep as Nosh Queens.
White Panty Superette [Internet] And indeed, by six o’clock that same evening we were noshing down on each others’ ‘cakes’ as if nothing untoward, like fame, success or sexual straightness, had ever taken place at all.
[UK]in Guardian 18 Apr. [Internet] To say that she noshed me off for a good review is probably a bit unfair.