Definition of what's with
informal
1
: what is the reason for (something)
(So) what's with the hat?
2
: what is wrong with (someone or something)
What's with him? Is he upset?
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“What's with.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/what%27s%20with. Accessed 30 Jun. 2022.
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