Jisho

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けい 敬語
Noun
1. polite Japanese as used by young part-time employees in restaurants, etc.Derogatory, See also バイト, See also 敬語
Wikipedia definition
2. Manual keigo, is a controversial form of honorifics (keigo) in the Japanese language. Employers such as fast-food and convenience-store chains publish training manuals for employees, especially young part-timers who have little experience with honorifics. These manuals incorporate nonstandard formulas for servers and cashiers to use when addressing customers, most often by using alternate expression which are longer and vaguer than the standard expression.
Read “Manual keigo” on English Wikipedia
Read “バイト敬語” on Japanese Wikipedia
Read “Manual keigo” on DBpedia

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