The phrase "lavish lifestyle" refers to an extravagant way of living, where someone spends a lot of money on luxurious things and indulges in luxurious experiences.
If you expect to want a more lavish lifestyle in retirement than while working, you want to save more. (rismedia.com)
They live a very lavish lifestyle and make no bones about it... greed... how many kids went to bed hungry...? (religion.blogs.cnn.com)
She flew to Haiti and endorsed the Duvaliers, who murdered thousands of their countrymen and lived lavish lifestyles with money stolen from their people. (religion.blogs.cnn.com)