A glossy taco is a nickname made by the holo queen and famous youtuber Cristine, aka SimplyNailogical, for a normal glossy topcoat.
It is used to finish off a nail when painted and give it a glossy looking vibe.
'Just did my nails, now let's add a glossy taco.'
'Let's add a glossy taco 'cause we're gonna add nail vinyls next.'