Green’s Dictionary of Slang

something n.

1. [mid-19C+] a euph. for the obscenity or oath of the speaker’s choice, e.g. ‘I don’t give a something’, i.e. a fuck n. (2a) or a damn n.

2. [1920s+] (orig. US) a remarkable thing or person, e.g. She’s really something!

In exclamations

something else!

[20C+] an excl. or description of approval or wonder; also as n.

SE in slang uses

In compounds

something damp (n.)

[mid-19C–1900s] a drink.

something good (n.)

[mid-19C+] a useful opportunity for gain, e.g. a good racing tip.

In phrases

get something from someone (v.)

[1940s] (US black) to attack someone physically, esp. with a knife.

get something on someone (v.)

[1910s+] (orig. US) to find out incriminating or otherwise negative information about someone, to gain an advantage over someone.

give someone something (v.) [ironic]

[late 19C] to thrash, to beat.

have something on someone (v.) [20C+] (orig. US Und.)

1. to have someone at a disadvantage, usu. through incriminating or negative information.

2. to be popular with.

3. to be better than, although usu. in negative.

something in the City (n.) [ironic play on SE]

[late 19C] a dubious figure, prob. a fraudster or even a burglar.

something on the ball (n.) [baseball imagery]

[1910s+] (US) skill, talent, great ability; thus negative phr. nothing on the ball.

something’s rotten in Denmark [Hamlet I:iv: ‘Something is rotten in the state of Denmark’ + ref. to the pioneering operation undergone in Denmark by Christine (formerly George) Jorgensen]

[1950s+] (gay) referring to someone who is presumed to have had a sex-change.

something the cat (has) brought in (n.) (also something Puss dragged in, something the cat dragged in, something a dog would bring in)

[20C+] a distasteful, prob. dirty or unkempt, object or person.

that’s another something

[1970s] (US black) that’s a different matter.