One-Armed Robber is a free co-op heist game released on Steam in 2023, built around robbing stores and banks with deliberately awkward one-handed weapon handling. Detection is central to its loop, because civilians, guards and cameras can witness crimes and alert police, ending stealth. Short alert cues like this one were clipped by players and shared on soundboards for edits about being seen. Its meaning is close to a classic enemy spotted callout, instantly understood even outside the game as a warning that cover is blown and trouble is coming.