ego trip
US /ˈiː.ɡoʊ ˌtrɪp/
UK /ˈiː.ɡoʊ ˌtrɪp/

1.
trip d'ego, auto-satisfaction
an act or period of self-indulgent behavior, often motivated by a desire to impress others or boost one's own self-importance
:
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His long speech was just an ego trip, full of self-praise.
Son long discours n'était qu'un trip d'ego, plein d'auto-louange.
•
She accused him of being on an ego trip when he insisted on taking all the credit.
Elle l'a accusé d'être en plein trip d'ego quand il a insisté pour s'attribuer tout le mérite.