"Heavy eyeliner" refers to the application of a significant amount of eyeliner on the upper or lower eyelids to create a bold, noticeable, and defined look around the eyes. Full definition
I had struggled with weight my whole life — as a chubby, bullied kid, an awkward teenager clad in heavy eyeliner, and as an adult who crusaded for animal rights by day and ate entire soy - cheese pizzas by night. (mindbodygreen.com)