Many people get this wrong, but the real definition of a bear when referring to a person is someone with an angry attitude but under control, someone so manly that they are beyond man, but a good man all around. The term can be used for females, but it means in a sense that they are protective mothers, but are also tendering. A prime indicator of a bear is being enraged with scary fury during debates and hot topics because they have no tolerance for stupid and primitive people. Steven Colbert is right to fear bears, but they only attack when they have a reason.
Guy 1: "Christo is a fucking bear! Did you hear him growling at Emma during the class discussion?"
Guy 2: "Well, she deserved it. She didn't want stoners to breed. No sense of personal freedom with her."
Guy 1: "Well, she should count herself lucky for Christo holding himself back. He wanted to maul her face off!"