A jokingly derogatory term Aggies use for Bevo, the longhorn mascot of the University of Texas. Indicates that the creature (and the school, by extension) is of exceptionally poor quality and is only fit to be ground-up and served as taco meat.
This term became especially popular after an ESPNU commercial depicting an Aggie playing a Pictionary/charades-like game. The visual prompt included UT's longhorn logo and a hook. The aggie refused to answer "Hook 'em Horns" and instead refers to the longhorn (somewhat disgustedly) as taco meat.
Some vaginas can be classified as fish lips, while some tacos. The extra flap in some vaginas is called the taco meat. The vagina is like a taco, and the meat is the flab.