Meatmud
A food product used as a less costly and thus more profitable alternative to legitimate meat. Composed largely of material to provide real estate for seasoning to give the sensation of meat.
The fact is that the containers in which the taco meatmud arrives to their establishments is labeled as "taco meat filling," which is exactly how it should be labeled in all advertising and packaging according to the USDA. (Diaz, Gizmodo.com)