Green’s Dictionary of Slang

stomach n.

In derivatives

stomacher (n.)

a drink, a measure of alcohol.

[UK]B. Weatherby Great News from Hell 42: Tip me another Stomacher, says she [...] she then tossed off a full Gill of Coniac.

SE in slang uses

In compounds

stomach Steinway (n.) (also stomach pump) [SE stomach, against which it is held + Steinway, a piano; allegedly coined by Mark Twain, although there are no apparent examples of his use]

(US) a piano accordion.

[UK]Oakland Trib. (CA) 12 Nov. 14/2: Instrumental selections by [Boy] Scout artists playing ‘stomach steinways,’ accordians and other musical instruments.
[US]Dly News (NY) 16 Apr. 34: Stomach pump — Accordion.
[US]Indiana Eve. Gazette 20 Mar. 9/2: An accordion may be called a ‘stomach pump.’.
[US]L.A. Times 29 May 29/1: I still like ‘musical stomach pump’ for accordion.
Pittsburgh Post Gaz. (PA) 3 July 22/3: ‘Variety’ calls an accordian a ‘stomach Steinway’.
[US]Dly News (NY) 25 Mar. 207/1: An accordian playing DP family [...] celebrated their arrival [...] by unlimbering their stomach Steinways in a rendition of ‘God Bless America’.
Kingston Dly Freeman (NY) 19 Oct. 12/2: [cartoon caption] ‘Lemme hear that band! Two kazoos, a ukelele and a stomach Steinway’.
[US]Times (Shreveport, LA) 13 July 18/4: ‘People call it a squeeze box or a stomach Steinway’.
Record (Hackensack, NJ) 9 Aug. PE-4/3: Paddy the Squint suqeezed out Irish airs on the stomach Steinway.
[US]Santa Cruz Sentinel (CA) 8 Mar. 44/4: He got his first squeeze box(also called [...] the ‘stomach Steinway’) for Christmas 1956.
[US]Victoria Advocate (TX) 30 July 47/3: Writer mark Twain dubbed the accordion the ‘stomach Steinway’.
Hilltop Press (Cincinnati, OH) 3 Apr. B8/5: They subsequently added the ‘Stomach Steinway’ stylings of Joey [...] on accordion and baritone vocals.

In phrases

my stomach is hitting/touching my backbone

phr. expressing extreme hunger.

[US]A.C. Huber Diary of a Doughboy 19 Sept. 🌐 And I’m not singing the ‘Blues’ either, for it’s a actual fact for I feel like my stomach is touching my backbone.
[US]Vermont History 26 288: So hungry my stomach is touching my backbone.
[US]R. Nelson Cherished Reward 45: ‘I’m so hungry , my stomach is touching my backbone,’ Tanner declared. He faked filling his mouth and chewing .
[US]S.A. Crosby Razorblade Tears 41: ‘I’m so hungry my stomach is hitting my backbone’.