Green’s Dictionary of Slang

shock n.

[the dictum that, after drinking it, ‘you get a shock, walk a block and fall in the gutter’]

(US) a measure of cheap liquor.

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[US]O.O. McIntyre Day By Day in New York 22 Feb. [synd. col.] Orlie Huff is back on the bowery — back where the five-cent whiskies are called ‘shocks’.
[US]E. O’Neill Anna Christie Act I: (They range themselves at the bar.) Gimme a shock.
[US]C.W. Willemse Cop Remembers 136: They used to call them ‘block and fall joints.’ You get a shock walk a block and fall in the gutter.

In compounds

shock house (n.) (also shock joint) [SE house/joint n. (3b)]

(US) a tavern, catering mainly to black people, in which customers would most likely be given some form of knockout drop in their drink and then robbed.

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[US]Irwin Amer. Tramp and Und. Sl. 168: Shock Joint. – A cheap saloon or speakeasy where the liquor is all of a sort which ‘shocks’ or galvanizes the drinker for a short time or until two or three drinks are consumed, then sends him into a drugged sleep.
[US](con. late 19C) C.W. Willemse Cop Remembers 136: A few doors away was a five-cent ‘shock house,’ a cheap liquor store for colored men.
[US]A.J. Liebling Back Where I Came From (1990) 140: The shock houses have cleaned up their windows [...] and obtained liquor licenses.

SE in slang uses

In compounds

shock-absorbers (n.)

the female breasts.

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[UK]Partridge DSUE (8th edn) 1055/2: since ca. 1950.
shock-out (n.)

(W.I.) anything exceptionally eye-catching.

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[WI]Francis-Jackson Official Dancehall Dict. 48: Shock-out (of appearance) anything fabulous or eye catching: u. de car a shock-out/it’s eye catching.

In phrases