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"What's up" is a correct and usable phrase in written English
It is a common informal greeting or conversation starter, used to ask someone how they are doing or what they have been up to. Example: "Hey, long time no see! What's up with you these days?" "I just got back from a trip to Europe. What's up with you?"
Idiom
What's up?
This can be used to ask 'What's wrong?' or 'How are you?'.
Dictionary
What's up
phrase
What are you doing?; what is happening?
Exact(60)
What's up Walker's sleeve next?
What's up?
"What's up?" he said.
"What's up?" Uncanny timing.
"What's up?" we breathed.
What's up there?
"What's up, New York?
"What's up?" asked Lynne.
"What's up?" I asked.
"What's up?" (Snort).
"What's up everybody?
More suggestions(4)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com