Glossy Taco

Glossy Taco: a clear coat of nail polish top coat designed to give nails a glossy finish. It is popularized by YouTube personality Cristine from the channel SimplyNailogical. She refers to all polish top coats as "tacos." She made a videos applying 100 layers of "glossy tacos" and ruined YouTube.
See: glossy top coat

"Cristine from SimplyNailogical uses a glossy taco to make her holographic designs show better on her nails."
"....glossy taco? Wut?"
"It is a slang term for glossy top coat. I can't say it properly anymore."

"I love this color, now all it needs is a glossy taco!"