Green’s Dictionary of Slang

Darlo n.

[abbr. + -o sfx (3)]

1. (Aus.) Darlinghurst.

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[Aus]Sun (Sydney) 20 Oct. 15/2: Instead of having de Groot charged with a crime and making a big man of him, he bundles him into the nut house at Darlo.
[Aus] ‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxiv 4/3: darlo cop shop: Darlinghurst police station in Sydney.
[Aus]J. Byrell Lairs, Urgers & Coat-Tuggers 255: [A] struggling urger who prowled around the Cross and Darlo and Paddo and anywhere else he wasn’t likely to be sprung in the crowd.
[Aus](con. 1945–6) P. Doyle Devil’s Jump (2008) 34: At Darlo I was made to wait in an empty room.

2. (UK) Darlington.

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Twitter 9 June 🌐 Labour hold Darlington. [...] Yes Darlo.

In compounds

Darlo drop (n.)

(Aus. police/Und.) police brutality towards a victim in custody.

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[Aus]G. Seal Lingo 51: In fact, the darlo drop is used to mean any kind of police brutality that takes place while the victim is in custody and has been so used in Sydney for a very long time.