If you're using it for social media, it works best when someone (or yourself) looks significantly different or "rougher" than usual.
The phrase is versatile and its intent depends heavily on the speaker's tone: Ne Gundesen Sen
Only use it with people you are comfortable with, as it can be offensive if taken as a literal insult regarding someone's appearance. If you're using it for social media, it
Used among friends when someone looks messy, tired, or is acting silly. or is acting silly.