When a person's emotions go from extreme high to extreme low in a short period of time. This variation can sometimes be scary, irritating, or evenannoying!! >_<
A crazy guy who abuses power, pretends to be loaded, throws people through windows, sues people for no damn reason, and then tells them how much he likes them!
That moody is oneunhinged mug, the took a bat to my car and then asked if I wanted ice cream!