(as|) proud as a peacock

used to describe someone who has an excessively high opinion of themselves

The phrase "proud as a peacock" originated in English literature during the 14th century and refers to someone who is excessively proud or boastful, drawing comparison to the vibrant display of a peacock's feathers. This idiom is used informally to describe individuals who are excessively proud or boastful, often seeking attention or admiration from others.

He boasted about his family's wealth and connections, proud as a peacock, believing it made him superior to others.
He strutted around with his new car, proud as a peacock, eager to show off his latest possession.
She flaunted her achievements at every opportunity, as proud as a peacock, seeking validation from others.
She paraded around in her extravagant outfit, proud as a peacock, demanding attention and admiration.
The athlete stood on the podium, proud as a peacock, basking in the glory of winning the championship.