Green’s Dictionary of Slang

say v.

[1900s] (US Und.) to rob; to break into.

SE in slang uses

In phrases

ain’t saying nothing

[1970s] (US black) a dismissive phr. suggesting that nothing you say is of the slightest importance.

he-say-she-say (n.) (also he-said-she-said, he-say-she-say talk)

[1960s–80s] (US black) gossip, chatter, loose talk.

I bet you say that to all the boys/girls

[1930s+] a teasing phr. orig. used by women to men but latterly by either sex; it follows a compliment or ‘line’; thus fig. ext. to any person.

I’ll say (so)

[1910s+] (orig. US) absolutely, definitely, I couldn’t agree more.

I’m saying (doe)

[2000s] (US black) a phr. of agreement, affirmation.

say a mouthful (v.) (also say an armful, ...a page full, speak an armful, …a mouthful)(orig. US)

1. [early 19C+] to say something important and true.

2. [1920s+] to talk at length, esp. critically.

3. [1940s–70s] (gay) to reprove a fellow homosexual in detail and at great length.

say nothing (v.)

[1950s–60s] (US black) to talk trivially.

say something (v.)

[1910s+] (US) to make an important statement, to say something profound; lit. or fig.

say what? (also says which?)

[20C+] (US) an expression of mock disbelief, e.g. what did you say? are you telling the truth?

say when

[late 19C+] a formula used when pouring someone else a drink, i.e. say when you want me to stop pouring.

what do you say?

[1920s+] (US) how are you?

what-I-might-say (n.)

[20C+] (US black) a euph. for an obscenity.

what say?

1. [early 19C+] (orig. US) what did you say? what was that? what do you think?; occas. as excl.

2. used as a greeting.

you can say that again

[1940s+] (orig. US) a phr. underlining the speaker’s agreement with the previous statement.

you don’t say (also you don’t say so, you don’t say that, you don’t tell)

[early 19C+] a heavily sarcastic response to a statement of the obvious.

In exclamations

says you! (also sez you!)

[mid-19C+] a general excl. of contempt and disbelief, dismissing as beneath argument the previous speaker’s words.