A thick and glossy layer of top coat over your nails. (possibly holo)
This term has been created by the queen of holosexuals Cristine (aka Simply Nailogical on Youtube)
Cristine: " I suppose you don't have to put on a final coat of glossy taco. You could leave it--a little--textured. But you know me girl, I'm all about that glossy taco hahaha "