popinjay

popinjay \POP-in-jay\, noun:
A vain and talkative person.

She watched him degenerate from the man of substance she once knew into a mere popinjay.
Come to think of it, the Popinjays are so vain and talkative, it sort of makes sense that their last name is Popinjay!
This party is populated with nothing but popinjays!
It's mopping day, popinjay!
The road to hell is paved with popinjays!
He's a whopping popinjay who just won't stop popping!