Green’s Dictionary of Slang

knob n.

1. representative of body parts.

(a) [18C+] the head.

(b) [late 19C+] (also cock-knob) the head of the penis.

(c) [1910s+] the penis.

(d) [1930s+] (also knobbies) a female breast, usu. in pl. as knobs.

(e) [1930s+] (US) spec. a woman’s nipple, usu. in pl. as knobs.

(f) [1940s+] (US black) the knee, usu. in pl. as knobs.

(g) [1950s+] (US teen) in fig. use of sense 1c, a general term of abuse.

2. in gambling use.

(a) [mid–late 19C] a swindling fairground game, also called ‘under and over’.

(b) see nob n.1 (9)

3. [1930s–60s] (US black) in pl., stylish, up-to-date shoes with shined toecaps [? the shape of the toecap].

4. [1940s] (US) the police.

5. [1960s] a blow.

In compounds

knob artist (n.) (also nob artist) [-artist sfx]

[1990s+] a male homosexual.

knob-end (n.) [SE end; lit. the glans penis]

[1990s+] a general derog. term.

knob-gobbling (n.) [gobble v.1 (2)]

[1960s+] fellatio; thus knob-gobbler, a fellatrix or fellator.

knobhead (n.)

see separate entry.

knob-job (n.) [job n.2 (2)]

[1960s+] (orig. US) fellatio.

knob-jockey (n.) [jockey n.2 (3b)]

1. [1990s+] a general insult, implying that the male subject is a masturbator or a homosexual.

2. a sexually voracious woman.

knob polisher (n.)

[1960s+] a young male prostitute; thus knob polish, to masturbate.

knob shiner (n.) [1990s+]

1. a masturbator; thus knob-shining n.

2. a general term of abuse.

3. a homosexual.

knobstick (n.)

see separate entry.

In phrases

carve someone’s knob (v.)

[1950s] (US black) to explain, to make understand.

do the knob (v.)

[1950s] to take notice.

gob the knob (v.)

[1990s+] (US) to perform fellatio.

go where the big knobs hang out (v.) [play on sense 1b /nob n.2 (1)]

[1960s–70s] (Aus.) to urinate.

lose one’s knob (v.)

[1910s] (Aus.) to go mad, to break down.

polish the knob (v.)

[1970s+] (US gay) to fellate.

slob a knob (v.)

[1940s+] (US) to perform fellatio.

SE in slang uses

In compounds

knob-knocker (n.)

[1920s] (US tramp) a safe cracker.

knob-twister (n.) [the knobs on the betting board]

[1980s] (Aus.) a bookmaker.

In phrases

with knobs on (also with nobs on) [i.e. with ‘extras’]

1. [1920s+] embellished, with ‘add-ons’, to the utmost.

2. [1920s+] (usu. UK juv.) a retort meaning the same to you and more so.

3. [1920s+] for certain, absolutely.