The phrase comes from the Latin American Spanish dub of Pixar's Monsters, Inc., released in 2001, where Wazowski is the one-eyed monster Mike. In Spanish, cuidadito is a diminutive warning meaning watch out or be careful, which made the line easy to quote outside the film. Spanish-speaking users spread short clips of it across messaging apps and short video platforms as a joking caution, and it stayed popular because the reference is widely recognised and the delivery fits almost any minor threat or slip-up.