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Discover Ludwig"smarty pants" is a correct and usable phrase in written English.
You can use it to describe someone who is intelligent or cunning. For example, "John is such a smarty pants; he always seems to know the answer to every question!".
Dictionary
smarty pants
noun
A smart aleck or know-it-all
Exact(23)
K. Oh, smarty pants!
Why don't you write a column about that, smarty pants?
In 2011, he also bought Mental Floss, a smarty pants magazine and Web site aimed at a young, connected demographic.
The older, Porter Anton Yelchinn), one of those teenage smarty pants who roam through American independent cinema, is more grudging.
"They would love to see a false smarty pants decapitated by a real intellectual," Land told me.
Alright then smarty pants.
Similar(36)
A smarty-pants, and funny with it.
"No, Paulina," smarty-pants Dean explains.
Reputations as smarty-pants know-it-alls.
Remember how Ireland's vigorous recovery proved Keynesian economics — and smarty-pants Keynesian economists — wrong?
Rather than smart, they are smarty-pants: smug, priggish and set up for a pratfall.
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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