기 분 나 쁘 다.
Does it mean that I am in horrible mood?Is it right on grammar?O(∩_∩)OThank you in advance.

Question

Answer

기분 (mood) 나쁘다 (to be bad)  means "To be in a good mood" (infinitive sentence). 
100% correct would be 기분이 나쁘다 (marking the mood as subject of the sentence.
if you want to say "I am in a bad mood" you can write: 기분(이) 나빠요.

Answer

We also say 기분 나쁘다 to mean "I am offended."