What’s up with that?
interjection
Used to ask why something is happing or being done.
He is always arriving late, what's up with that?
Often appears as...
- what's up with that?
- what's up with him?
Usage tips
Informal
Colloquial
interjection
Express confusion or curiosity about a previously mentioned or noticeable situation.
She has been acting strange lately, what's up with that?
Often appears as...
- what's up with it?
- what's up with this?
Usage tips
Informal
Idiomatic
interjection
Used to ask why something is happing or being done.
He is always arriving late, what's up with that?
Often appears as...
- what's up with that?
- what's up with him?
Usage tips
Informal
Colloquial
interjection
Express confusion or curiosity about a previously mentioned or noticeable situation.
She has been acting strange lately, what's up with that?
Often appears as...
- what's up with it?
- what's up with this?
Usage tips
Informal
Idiomatic
Definition 1 of 2
Pro Tip 1/3Informal Usage
Used in casual situations among friends or peers, not in formal contexts.
You're wearing flip-flops in winter, what's up with that?
Pro Tip 2/3Expressing Annoyance
Can indicate irritation or annoyance about the situation in question.
He left without cleaning up, what's up with that?
Pro Tip 3/3Seeking Explanation
Used to prompt an explanation for something odd or unexpected.
This app just crashed again, what's up with that?
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