Green’s Dictionary of Slang

charlie n.8

[charlie wheeler n., but Simes, A Dict. of Australian Underworld Slang (1993), adds: ‘“Charlie” was an old Eng. name for nightwatchman: this may be the origin’]
(Aus.)

1. a woman.

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[Aus]L. Glassop Lucky Palmer 41: Who was that Charlie I seen you with last night?
[Aus] ‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxiii 4/3: charlie: Female.

2. a prostitute.

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[UK]J. Morton Lowspeak.

3. a male homosexual.

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[US]Trimble 5000 Adult Sex Words and Phrases.

4. see charlie wheeler n.