Green’s Dictionary of Slang

lord rex n.

[rhy. sl. = sex ]
(Aus./N.Z. prison)

1. sexual intercourse.

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[Aus]J. Alard He who Shoots Last 91: I’ll settle for a gangster show meself or maybe one wid a bita Lord Rex in it.
[NZ]G. Newbold Big Huey 250: lord rex (n) Sex.

2. (also lord rexo) sex.

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[NZ]G. Newbold Big Huey 250: Lord Rex (n) Sex.
[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 110/2: lord rexo n. sex.

3. a sex offender.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 110/2: lord rex n. a sex offender.