An "inflated ego" refers to someone who has an exaggerated sense of their own importance or abilities. It means they have a high opinion of themselves and often think they are better, smarter, or more talented than others. Full definition
I have yet to meet another man with such an over inflated ego...... his money, his businesses..... (datinggoddess.com)
sometimes wonder if players wanting to come play for us are put off somehow by ramsey and walcott posturing around with inflated egos boasting about their 10 yrs being selected in the arsenal first 11 and in terms of mounting a prem league challenge both have achieved diddly squat. (justarsenal.com)
I understand that NFL players have been told that they're special for their entire lives, and this culture of making them a celebrity since high school has a way of inflating their ego. (sbnation.com)