You could use the "appropriate" definition, which is that it's a term coined by Cristine Rotenberg from Simply Nailogical, but we're all dirty here. A glossy taco is, for lack of better words, a wet pussy. Taco emoji=sext for pussy, glossy=wet, meaning that there's the aftereffects of orgasm or cum on the pussy.
A Mexicanwoman's vagina that has blonde trimmed hairs and smells like fish.
As Paco went down on Consuela, he realized her trimmed blonde public hairs were as bright as American cheese and her vagina smelled like fish. Thus making it a Paco Taco.