(informal) Alternative form of how do you do

(colloquial) Any of several additional, unmentioned things

Alternative spelling of what have you.

(dialectal, Britain, Ireland) A traditional folk or country song.

(euphemistic, slang) Fuck you.

(idiomatic) An emphatic form of believe me: you (the subject) had better believe me (the speaker).

really?; no kidding!; is that so? (sometimes used sarcastically in response to the obvious)

(economics) A financial policy by which capital projects are financed from current revenue in the operating budget rather than through borrowing.

(rhetorical question, sarcastic) Used in response to someone’s threat suggesting that the person in question cannot do what she or he says alone.

Alternative spelling of you-know-who