Green’s Dictionary of Slang

Hilton n.

(N.Z. prison) a prison, esp. the New Plymouth Prison (closed 2013).

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 87/1: Hilton, the n. a prison, most frequently applied to New Plymouth Prison.

In compounds

highway Hilton

(Aus.) a motel.

[Aus]Betoota-isms 189: 1. A three-star motor inn 2. A family owned and operated motel, offering affordable accommodation (including breakfast) 3. Roadside hotel located within 200 metres of a service station.