Green’s Dictionary of Slang

jam n.2

[SE jam, the fruit conserve]

1. in context of pleasure, advantage [orig. sporting jargon real jam, anything exceptionally good].

(a) [mid-19C+] profit, an advantage.

(b) [mid-19C+] something very enjoyable.

(c) [mid-19C+] anything easy.

2. [late 19C+] (Aus.) images of excessive ‘sweetness’.

(a) affectation, pretentiousness; thus show jam, to act in an affected manner.

(b) toadying.

3. [1920s–40s] (US Und., also jamb) small stolen articles, i.e. personal jewellery.

4. bodily fluids.

(a) [1940s+] (US gay) faeces; often in the context of homosexual foreplay.

(b) [1960s+] menstrual blood.

(c) [1960s+] (US black) semen.

(d) [2000s] vaginal secretions.

In compounds

jam fag (n.) [fag n.4 (1)]

[1940s+] a homosexual with no other sexual interests.

jam rag (n.)

[1960s+] a tampon, a sanitary towel.

In phrases

eat jam (v.) [SE eat/eat v. (4) + sense 4a above]

[1940s+] (US gay) to lick the anus.

give her the jampot (v.) [sense 4c above]

[1980s] (US black) to have sexual intercourse.

jam off (v.)

[2000s] to ejaculate.

put on jam (v.) (also lay on jam)(Aus.)

1. [late 19C–1900s] to put on airs.

2. [1900s] to flatter.

real jam (n.) (also real Peruvian doughnuts) [orig. sporting jargon]

[mid-19C–1910s] of objects or people, the best, the superlative.

SE in slang uses

In compounds

jampot (n.)

see separate entry.

jam sandwich (n.) (also jam butty) [the fluorescent coloured stripe running round the middle of the car]

[1980s+] a police car.

In phrases

jam on your egg (n.) [? SE do you want jam on it?, a phr. meaning to stop complaining/being so demanding]

[2000s] (Irish) wishful thinking.

jam-tin brigade (n.)

[1930s] (Aus. tramp) the lowest rank of itinerant, eating/cooking out of jam-tins.