When someone splurges, they spend a lot of money on something special or luxurious.
Splurging can be fun, but it can also be a little wasteful if you do it too much.
Examples:
She splurges on a fancy dinner for her birthday.
He splurges on a new watch.
They splurge on a big vacation every year.
I splurge on a giant ice cream cone.
My mom splurges on a huge diamond ring.
The cat splurges on a big bag of cat treats.