What is the definition of Mks3?

Mks3, my friend, is the playful abbreviation for "Mysterious Killer System 3." Now, here's a sentence that might send shivers down your spine and make you think twice about that coffee shop: "I ordered Mks3 at the corner diner, expecting a zombie apocalypse, but instead I got a digital skull staring back at me with a side of existential dread."