When someone, typically a chick, is upset about something small therefore causing the chick to freak out and act like a child over something small and of no consequence. The freak out episode normally lasts only for a few minutes - thus a BiPolar Moment
We were all at the house playing charades having a fun time. It was Lisa's turn to act out a phrase and again she couldn't seem to get anyone on her team to guess the phrase, time expired and Lisa stood up threw her full glass of wine on the wall. We all felt bad for her boyfriend Marshall, who just sat there shaking his head apologizing for her tantrum, he was trying to blame it on the alcohol, but we all knew the truth. This crazy chick was having a BiPolar Moment.