An acknowledgment of a fact, implying indifference or low-level disdain. Like the CB radio term "10-4", but of mundane or slightly annoying real-life situations.
Someone who gives zero fucks about anything. They do whatever they want, whenever they want, wherever they want!
Conner: "Yo Ethan! Did you do the assignment for Grad School?"
Ethan: "Nah Bro, I am a Super Gremlin, I skipped class and smoked a backwood the size of King Kong's finger with the Professors wife."