1. 꿀잼 (ggul-jaem) | Honey-fun (lots of fun)
When you are having so much fun, it is like eating honey.
Example:
A: 콘서트 어땠어? (kon-seo-teu eo-ddae-sseo?)
How was the concert?
B: 꿀잼! (ggul-jaem!)
So fun!
2. 노잼 (no-jaem) | No fun
When something is not enjoyable at all.
Example:
A: 드라마 재밌어? (deu-la-ma jae-mi-sseo?)
Was the drama interesting?
B: 진짜 노잼이야. (jin-jja no-jaem-i-ya.)
It was not fun.