Too often we misuse or blatantly use a word incorrectly, no big deal, right? Wrong! The saying sticks and stones may break my bones but words can never hurt me, could not be further from the truth in this sense.
Our society and media outlets tends to like using mental disorders and/or psychological terms synonymously as adjectives for something that is usually trivial. This practice is what continues to perpetuate stigmas not only within the mental health field but also for those who struggle with their mental health.
If you mean to say your mother yelled at you no reason that you can think of, and that you think she's being irrational, just SAY THAT and not that she is bi-polar. Chances are your mother does not struggle with bi-polar disorder, and the language used in the incorrect statement could be harmful to someone who does. Also know that it can steer someone away from getting the help and/or support they need if we continue to misuse and lightly throw terms around insensitively.