(idiomatic, dated) Something of the kind, whatever (used to terminate a vague list).

Alternative spelling of whatnot

(UK, dated) Used to add emphasis to, and to seek agreement with, a previous statement.

Alternative form of what's what

(idiomatic) Precisely what the situation really is or what the facts truly are; the true state of things.

(euphemistic, African-American Vernacular) What the hell.

(Manglish, Singlish) Emphasizes the truth of an assertion made to contradict an evidently false assumption held by the listener.

(interrogative) Which thing, event, circumstance, etc.: used in asking for the specification of an identity, quantity, quality, etc. / (fused relative) That which; those that; the thing(s) that.

(obsolete, uncountable) Something; thing; stuff. / (countable) The identity of a thing, as an answer to a question of what.

An expression of surprise or disbelief. / What do you want? An abrupt, usually unfriendly enquiry as to what a person desires.