Definition of what's with
- (So) what's with the hat?
- What's with him? Is he upset?
used as an interrogative expressing inquiry about the identity, nature, or value of an object or matter
often used to ask for repetition of an utterance or part of an utterance not properly heard or understood
: in what respect : how
used as an interrogative expressing inquiry about the identity, nature, or value of a person, object, or matter
: how remarkable or striking for good or bad qualities
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