노잼 (No-Jam)

Acronym

If something or someone is 노잼, it means it's not funny.


Example

A: 어제 개그콘서트 봤어?
Did you watch Gag Concert last night?
B: 응 완전 노잼.
Yes, it was awfully boring.

Origin
The prefix 노(no) emanated from English no, simply meaning not. 잼(Jam) is a shortened form of Korean word, 재미(Jaemi: fun), the predicative form of which is 재미있다(Jaemeetda), interchangeably meaning it's fun or it's funny.

It is difficult to assume when people started using this expression. Nevertheless, a catchy slogan from a Double A's commercial possibly inspired the first inventor of this expression.