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I am unsure what やついておる means in the following sentence:

…貴様、何をにやついておるのだ…？

For some context Person A is comforting Person B who has just heard some happy news and gotten emotional. Person C says the above sentence.

I've not come across やついておる in my studies before, can someone explain this to me?

Btob
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I think you parsed it wrong.

貴様、何をにやついておるのだ…？
What are you grinning at, you bastard?

It's にやつく 'smirk; grin', a compound formed from the sound symbolic noun にや 'smirk; grin' along with the verb つく.

You can tell it's not 何を＋に because that sequence of particles doesn't go together.