jade, n. — Green’s Dictionary of Slang

jade n.

[? one becomes SE jaded]

(Aus./US) a long jail sentence.

1859		Matsell Vocabulum 46: jade A long term of imprisonment.
1881		Trumble Sl. Dict. (1890).
1895		C. Crowe Aus. Sl. Dict. 39: Jade, a long term of imprisonment.
1901		Argus (Melbourne) 20 Sept. 6/4: Imprisonment for a long period is a jade, and for life a winder.
1955		N. Pulliam I Travelled a Lonely Land (1957) 234/2: jade – a long jail sentence.