From Longman Dictionary of Contemporary Englishego tripˈego ˌtrip noun [countable] if someone is on an ego trip, they think that what they do makes them more important than other people – used to show disapproval Their singer’s on a real ego trip.
Examples from the Corpus
ego trip• To possess power is the ultimate ego trip for many people.• My aggressive five-year ego trip along the path of separatism was over. 