Keigo is the system of honorific speech in Japanese, used to show respect to elders, bosses and strangers, and dropping it can sound deliberately rude. The phrase keigo tsukae became useful online as a standalone reaction because it needs no setup, the command itself is the punchline. Short voice clips like this travel through messaging apps and soundboards where users replay them out of context for comic timing. It stays popular in anime and language learning circles where everyone recognises the social pressure behind speaking properly.