Jinko is a multi-purpose word, that can be used in virtually any situation. It can be an adjective to describe any word, or an expression that can express frustration.
1. Wow, your new hat is so jinko!
2. Ohh, jinko! I forgot to do my homework.
3. Ughh, I'm feeling so jinko today, I think I need to see a doctor.
Jinkook is the ship name of Jin and Jungkook of BTS. They are both sexy visual gods and their voices harmonize really well. They bicker sometimes but they are full of love for each other.
If you see two guys wrestling but they have insane chemistry, you say "They're so jinkook".