Definition of balla
A "balla" gesture or action is made by someone who could be described as a "baller", that is, an exuberant person who ostensibly wants to demonstrate that he or she has money. The "baller" does "balla" things like walking into a club or nightclub and throwing banknotes around to give them to people. The expression also marks the overspending or capricious spending. Paying an extra 150 euros in delivery charges for an 80 euro item because you don't want to wait 1 day longer for regular delivery is balla. As you can see in this example, there is a disregard for money and a whim.
Other details about the term balla
The very embodiment of the term balla is probably Dan Bilzerian, a millionaire who claims to have made a fortune in poker. Bilzerian is known on social media for his love of guns and pretty girls. Playing poker for hundreds of thousands of dollars makes "balla". The "baller" obviously needs to impress people while showing that he has a lot of money. Today, the definition of the term has broadened and has become synonymous with "luxury". If a friend shows you his new Rolex at 10,000 euros, you can tell him that his watch is very "balla".