Green’s Dictionary of Slang

shoppying blue n.

[shop v.1 (2) + blue n.1 (2d)]

(Aus. Und.) a signed confession.

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[Aus]Bulletin (Sydney) 26 Apr. 44: That arse – you know, the consorter what dollied you on the bust last year – [...] Give me a nice serve in there and had the front to ask me to sign up for a shoppying blue after court.