A male person or entity whose name one does not remember or want to mention but that is known to the person to which one is speaking.

(idiomatic, colloquial) What did you say?; Huh?; expresses incredulity.

(African-American Vernacular) What's up? What's going on?

(US) A shop selling miscellanea.

(idiomatic) Used to add emphasis to “what” when beginning a question.

Considering what limited worth this advice, opinion, or suggestion might have for you; used to soften the presentation of unsolicited advice or information that may not be relevant.

(followed by a phrase) Regardless, in spite of. / (not followed by a phrase) Regardless of any or most possible adverse circumstances.

plural of what-if

Used to express regret or disappointment about an unfortunate event or piece of information.

Used other than figuratively or idiomatically: see guess, what.