A Beast
Everyone has at least one teacher that plays a significant role in their lives. Ours was in kindergarten but for all the wrong reasons. This person’s favorite teacher was their wrestling coach, who left an impression on him that would last a lifetime.
During his wrestling years, the coach would call him a “beast,” presumably because he knocked out his foes left and right. To remember his coach, the OP got a tattoo of the King of the Jungle, a literal beast. That has to be a pretty befitting nickname and tattoo for someone that can flip their opponents upside-down on the mat.