The line comes from Manatsu no Yo no Inmu, a 2001 Japanese video whose scenes were endlessly remixed on Nico Nico Douga in the late 2000s. Its cast, especially the character nicknamed Yajuu Senpai, became central figures in Inmu meme culture, with short voice clips quoted, subtitled and rearranged into MAD videos and soundboards. Omae yarimasu nee survived as one of the most quotable reactions because it can sound admiring or mocking depending on context, keeping it in rotation long after the original remixes peaked.