What do you say, with regard to a thing said or asked about, as when one asks an opinion.

Euphemistic form of the devil you say.

(colloquial) Synonym of I can tell you

(colloquial) Used to emphasize a command or an opinionated statement.

Expressing indignation or despair.

Alternative form of you'd better believe it

(proscribed) Alternative form of between you and me

I suggest (to you), I propose

(generally in an angry tone) bear in mind, remember

Depending on the speaker's language/culture, may be a greeting roughly equivalent to "how are you"