We can use the phrase "angry mood" to describe a state of being in which a person is feeling angry. The word "angry" is often used to describe a feeling of resentment or bitterness, and it is a common way to express this emotion. When used in the phrase "angry mood," it indicates that a person is feeling a sustained or prolonged state of anger. This can be used to describe a person's emotional state at a particular moment, or it can be used to describe their general disposition or demeanor.