Mostly younger people use 꿀잼. I think you aleady know what 꿀잼 means. But in case you don't know what it means, 꿀 is honey and 잼, 재미 is funny. so it means it really funny. so you can use when something is really funny. oh that is really 꿀잼. i give to you more specific example. when i saw some movie that is really funny, exciting, i can say to my Friends "the movie was really 꿀잼. 그 영화 진짜 꿀잼. and also we use 허니잼 (허니 is honey) and 존잼 (존잼 is 존* 재밌다 f***ing funny... my english is bad but i hope, my explain will be help you

꿀잼 means to be very very fun. Actually 꿀 means honey, and 잼 is contraction form of 재미. So it means 'Something is so fun that it seems like honey. 꿀잼 is newly coined word by young people. Maybe Some older people cannot understand the word. And it is used among young people very often. I'm running my own youtube channel for foreigners studying Korean. If you visit my channel, you can watch videos about Koran grammar, voca, culture, topik. copy and past https://www.youtube.com/channel/UCErPtvmn08v29X0A9uojavA