Splurge

To do something in excess, to go ham.

To spend a lot of money or eat a lot of food at one time.

"Bro, I just lifted weights for three hours! Im about to splurge at the dining hall..."

"I got my paycheck on thursday, so friday afternoon I splurged at the mall. I bought some new shoes and clothes. Now I can't pay rent. Can you cover my half too this month?"