Green’s Dictionary of Slang

molly n.1

[generic use of female name, underlined by Fr. molle, soft; note US regional dial. cut up molly, to act in an extravagant, frolicsome manner; ballad ‘The Maid’s Resolution to follow her Love’ (c.1820) which uses ‘Madam Molly’ for a woman who poses as a soldier]

1. [late 17C+] (also moll) a male homosexual, an effeminate man; also attrib.

2. [early 18C–1940s] (also molley, mollie) a prostitute.

3. [late 19C+] (Irish) a young woman.

4. (US) a fool.

In derivatives

mollyish (adj.) (also Miss-Mollyish)

[19C] effeminate.

In compounds

molly-booby (n.)

[1970s] (W.I., Bdos) a fool.

molly dike (n.)

[1970s–80s] (US gay) a lesbian.

molly-dooker (n.) [? duke n.3 , with derog. sense that an effeminate man, like a left-handed person, would be clumsy or ? mauley n.]

[1930s+] (Aus.) a left-handed person; thus molly-dook(ed), left-handed.

mollyhead (n.) (also mollyhawk) [-head sfx]

[1900s] a fool, a simpleton.

molly house (n.) [SE house/house n.1 (1)]

[early 18C–late 19C] a male homosexual brothel.

molly man (n.)

[1920s+] an effeminate homosexual.

molly-mop (n.) [dollymop n.]

[early 19C] an effeminate man.

mollyslop (adj.) [slop n.1 (2) ]

[late 19C] nonsensical, weak, with overtones of effeminacy.

In phrases

Miss Molly (n.)

[18C] an effeminate homosexual.

Tom Molly (n.)

[early 19C] an effeminate homosexual.