Marcianitos is the Spanish diminutive for Martians, and this stretched ohhhhh version circulates on Spanish-language soundboards and meme pages as a standalone reaction clip. At under two seconds it works like other short exclamations such as the bruh meme, shared for its timing rather than a longer scene. Its popularity comes from the contrast between the drawn-out panic and the cute word for little aliens, which lets editors reuse it for UFO jokes, strange characters and mock first-contact moments across short videos.