Green’s Dictionary of Slang

member n.1

[prior use is SE, Lat. membrum virile, ‘the virile member’, i.e. the penis]

[18C+] the penis.

In compounds

member mug (n.)

[late 17C–early 19C] a chamberpot.

In phrases

dropping member (n.)

[19C] the flaccid penis, esp. when afflicted with (temporary) impotence or with venereal disease.

hot member (n.)

see separate entry.

jolly member (n.)

[19C] the penis.

member for cockshire (n.) [puns on SE member and Cock(shire)/cock n.3 (1)]

[mid-19C] the penis.

member for horncastle (n.) [punning on SE member + horn n.1 ; thus double entendre in D’Urfey, Pills to Purge Melancholy (1719): ‘I am a cunning Constable, / And a Bag of Warrants I have here, / To Press sufficient Men and able, / At Horn-castle to appear / [...] / Where I miss the Man I’ll press the Wife’]

[late 18C–early 19C] a cuckold.

unruly member (n.) [play on usu. sense of tongue, from General Epistle of James, 3:5–8: ‘Even so the tongue is a little member [...] But the tongue can no man tame; it is an unruly evil, full of deadly poison’]

1. [late 17C-19C] the penis.

2. [mid-19C] the tongue.

SE in slang uses

In phrases

member of the catch club (n.) [they catch villains]

[late 18C–early 19C] a bailiff or bailiff’s assistant.