Green’s Dictionary of Slang

Johnny n.

also Johnnie

1. Johnny Walker whisky; differentiated as Johnny Red, Johnny Black, denoting labels/strength.

[Aus]D. Niland Call Me When the Cross Turns Over (1958) 34: I’m coming along to see you with half a bottle of Johnny.
[US]G. Scott-Heron Vulture (1996) 8: Now I sat in a fabulous crib drinking Johnny Black.
[US]G.V. Higgins Rat on Fire (1982) 62: ‘Suppose you want a drink to go with it.’ ‘Johnny Red and soda.’.
[Aus]B. Humphries Traveller’s Tool 34: The bottle of Johnny […] hits the deck and explodes.
[Ire]Share Slanguage.
[US](con. 1964–8) J. Ellroy Cold Six Thousand 383: Barb popped pills. Barb popped Johnnie Black.
R. Brunet ‘Lucky for Me’ in ThugLit Dec. [ebook] [O]rdering a pair of double Johnnie Reds.
[US]I. Fitzgerald Dirtbag, Massachusetts 97: Three Wise Men [...] A single huge shot glass, which had three regular-sized shots poured into it: Jack, Jim, and Johnnie.

2. see John n. (4)