1. A strong, aggressively protective mother. Likened to literal mother bears, which are notoriously violent and aggressive when confronting a danger to their offspring. She's usually quite demure and reserved, but she turns into a straight-up mama bear if you so much as look at her kids the wrong way.

2. A female police officer. The two fellas were busting each other up when a mama bear on patrol came round and threw them both in her squad car.