/ ˌhɔɪti ˈtɔɪti; NAmE / adjective
( old-fashioned , informal ) behaving in a way that suggests that you think you are more important than other people
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WORD ORIGIN
mid 17th cent. (as noun in the sense boisterous or silly behaviour , then as adjective meaning lively and playful ): from obsolete hoit indulge in riotous mirth , of unknown origin.