핵노잼 /haeng-no-jaem/
Extremely boring / Not funny at all
Combines 핵 (extremely) + 노잼 (no fun). The opposite of 꿀잼. Used when something is painfully dull or fails to get a laugh.
Examples
이 영화 핵노잼이었어
That movie was incredibly boring
오늘 수업 핵노잼
Class today was absolutely mind-numbing