This emoji portrays exaggerated sadness with tears gushing like a waterfall, similar to cartoons, so it's used not only for true sadness but also to express overwhelming feelings of being moved or joyful.

Lately, it's often used ironically to express intense emotions other than sadness; for instance, it comes off as witty in situations like 'crying from happiness' or 'laughing so hard I'm crying.' K-pop fans also use it a lot when they're moved by an incredible performance by their favorite idols.