아싸
assa
A loner, someone outside the crowd.
OriginFrom English “outsider.”
When to useUsually about yourself, jokingly.
CarefulCalling someone else 아싸 can sound mean.
Examples
나는 점심도 혼자 먹는 아싸야.
I'm such a loner I even eat lunch alone.
Korean life dictionary
22 short guides to words and manners