what's up with that

idiom

Definition of what's up with that

informal
used to ask for an explanation"Did you hear that he quit his job?" "Yeah. What's up with that?"

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“What's up with that.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/what%27s%20up%20with%20that. Accessed 27 Sep. 2020.

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