Green’s Dictionary of Slang

1. (US black) a woman.

1920		Ade Hand-made Fables 253: If she read a Novel containing a Love Scene, the other Maud Mullers thought she was a bit Daring.
1934		J.L. Kuethe ‘Prison Parlance’ in AS IX:1 27: maud. A woman.

2. a male prostitute.

1984

Partridge DSUE (8th edn) 727: since ca. 1940.

3. a dowdy or overweight male homosexual.

1964		Lavender Lex. n.p.: maud:– A slightly mocking term applied to another homosexual by another person.
1980		Maledicta IV:2 (Winter) 226: For some reason, Maud is traditional for a fat queen.