(slang, African-American Vernacular) A casual greeting.

Asks the interlocutor to identify an indicated object.

plural of whatness

(philosophy) Essence; quiddity. / Quality; quantity.

(colloquial) What did you just say? / Used other than figuratively or idiomatically: see what, was, that.

What about; used to ask someone to consider something or someone that they have apparently not considered.

(rare) Because of, due to.

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

Alternative spelling of whatnot

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