The type of girl who wants some "man meat" so bad that she will do anything for it. A meat monster stops at nothing to get hard cock as soon as possible.
Mitch: "Yo Zack check out that girl, she looks like she is begging to get fucked"
Zack: "That is a true meat monster, and I'm gonna give it to her!"
A guy that is so jacked that his muscles refrain him from placing his arms at his sides. They often can be seen in groups at the gym where they lift together and flex in front of the mirrors. Their massive size can be very intimidating, especially for normal sized men.