An informal greeting, asking how a person's life is going.

(colloquial) Alternative form of how about

Used to ask someone to repeat something

How come; why.

(slang, Britain) A whatsit; a thing which the speaker is unable or unwilling to specify more precisely. / (slang, Britain, euphemistic) Sexual intercourse.

(humorous, rhetorical question) Asked to tall people or someone that is at a high vantage point, either literally or metaphorically.

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

unspecified number / what number

(interrogative) What amount or quantity (of something stated or implied). / (specifically, when referring to the cost of an item) What amount of money.

(interrogative) To what degree; to what extent.