Here are 5 slang Korean expressions:
1. **대박 (daebak)**: This means "awesome," "amazing," or "incredible." It's used to express surprise or excitement about something.
2. **헐 (heol)**: This is an interjection used to express surprise, disbelief, or shock. It's similar to saying "what the heck" or "no way" in English.
3. **맛점 (matjeom)**: A shortened way of saying "맛있는 점심" (masinneun jeomsim), which means "delicious lunch." It's used when inviting someone to lunch or wishing them a good meal.
4. **케미 (kemi)**: This comes from the English word "chemistry." It's used to describe good chemistry or compatibility between people, particularly in terms of relationships or teamwork.
5. **인싸 (inssa)**: This is a slang term for someone who is "in" or popular, someone who is well-connected and socially active. It's the opposite of "아싸" (assa), which refers to an outsider or someone who is not popular.