Los Matteos comes from Steal a Brainrot, a Roblox stealing game that rose to popularity in 2025 around Italian brainrot characters with absurd names, voices and designs. In the game, players collect characters, guard their bases and steal rare finds from each other, and Secret characters sit near the top of that hierarchy. Clips of these characters spread through Roblox gameplay videos and short-form edits, where the Italian-style voice became part of the joke. Los Matteos remains popular because it instantly signals a high-value, hard-to-get moment.