NO! is a word used by John
Mak in LSC. NO! has no meaning.
When students do something
wrong, he doesn't know what to say and gets
confused, he says NO!
Student A does a maths question
wrong.
Mak: NO!
Student B is doing a maths question, he stops to think because he doesn't know how to do it.
Mak: NO!
Student C: ????