The Meat is a food item. when eaten it gives 1000 xp to the player. It spawns when any animal that is not a Blobfish/Worm/Fish dies. It was added when deeep.io was realeased. It can be eaten by all animals.
Blobfish, Worms, and Fish, and Pollocks do not spawn meat when they die because they do not give enough XP to spawn any meat. However, they do still grant some experience.