Green’s Dictionary of Slang

bobby n.

also b, bobbie
[Sir Robert Peel (1788–1850), who established the force in 19C. ‘The term is, however, older. The official square-keeper, who is always armed with a cane to drive away idle and disorderly urchins, has, time out of mind, been called by said urchins Bobby the Beadle. Bobby is also an old English word for striking, or hitting, a quality not unknown to policemen’ (Hotten, 1860)]

1. [mid-19C+] a British or Australian, occas. US, policeman, latterly any police officer.

2. [20C+] (US) an Englishman.

3. [1980s+] (Aus. prison) a prison officer.

4. (also boaby man) the penis, thus sexual intercourse; bobby juice, semen [? backform. bobby’s helmet ].

In compounds

bobby peeler (n.)

see separate entry.

bobby’s helmet (n.) (also bobby’s hat) [SE helmet/hat; the shape of the ‘bell end’]

[1930s+] the glans penis.

bobby’s labourers (n.) [SE labourer]

[late 19C] volunteers who joined up as special constables during the Fenian scares of the 1860s.

bobby twister (n.) [SE twist]

1. [mid-19C] a form of blow.

2. [late 19C] a thug who will stop at nothing, even killing a policeman.