(idiomatic, Britain, colloquial) An intensified version of what or huh.

Used other than figuratively or idiomatically: see fuck, you. / (idiomatic, offensive, markedly vulgar) Expression to show discontent with the other party, or to show contempt.

(Wales) see here

(vulgar) An insulting and humiliating action against somebody.

An expression of gratitude or politeness in response to something done or given.

(idiomatic) An informal greeting, not requiring a literal response. In form a question, and thus followed by a question mark. Typical responses include:

Alternative spelling of thank-you.

Short for (may) God bless you: said as a short prayer for the recipient. / (idiomatic) Said to someone who has just sneezed, as a polite remark.

(idiomatic, colloquial) Used to express the speaker's skepticism about a preceding statement concerning some desired or assumed state of affairs.

An expression of gratitude. / (as a modifier before a noun) That expresses thanks.