What does Activewear Slacker mean?

Activewear Slacker meaning in Urban Dictionary

This is your typical college student that may show up to course wearing sweatpants/track jeans, a hooded sweatshirt and slippers. Through the ankles up they appear as though they've been starting to warm up for a future foot race. Though, most often, these are generally struggling to contribute everything meaningful to class or to the world around them.