When a person is single-mindedly devoted to athletic performance, enjoys suffering through horrendous workouts, and never quits.
See that guy doing 150 barbell thrusters at 135lbs, for time? What a Meatbeast!
by Alpha_SaSQUATch July 20, 2010
A girl with insatiable hunger for the man meat.
Man, that meatbeast loves her bathroom parties.
by The Lizardardo October 07, 2008
When a person becomes so drunk and hungry that they will eat anything, including biting the people around them.
When Erik gets wasted he becomes the meatbeast and bites everybody in sight.
by Beer Wolfe November 07, 2007