Repeating the word "domo" as "domo domo" is an informal, playful, and colloquial expression in Japanese. Standing alone, domo means "very" or acts as a general greeting and polite filler. Doubling it up (domo domo) translates roughly to a cheerful "Hello, hello" or a light, breezy "Thanks so much, thanks." It is used almost exclusively among close friends or in lighthearted, informal exchanges to soften the tone of a greeting or acknowledgment.