kekko desu

Japanese: "No thanks", "I'm cool", "It's okay" - basically, a halfway polite, understated refusal. Only used by true otaku (who seem to have picked it up from watching anime subtitled) or actual Japanese people. Not to be confused with "kekkon suru" - to get married.

Friends: "Wanna dress up like maids with us?"
You: "Kekko desu."

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