"야작하다" 무슨 뜻이에요?
"과제 끝! 난 야작하고 갈 거니까 너 먼저 가~"

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야작하다 is short for 야간작업(을) 하다 or 야간작업하다.
야간작업 = night work (밤일).  (야간 = formal word for 'night time', 작업 = work, work procedure)

* 야간열차 = night train (train operating at night).
* 야간비행 = night flight.

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Thanks!

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Do night work.
I think I'll stay at school tonight and work at night.