Trail Blazers center Jusuf Nurkiu0107's wallet is now significantly lighter ... the NBA just fined him $40,000 for tossing a fan's phone in a confrontation after a game on Sunday.
The league announced the punishment Tuesday morning ... reprimanding the 27-year-old for his actions in a postgame spat with a Pacers supporter.
If you missed it, following Portland's 129-98 loss to Indiana at Gainbridge Fieldhouse ... Nurkic walked up to a fan, stared him down and then grabbed his phone and threw it.
Nurkic appeared to mutter some words to the guy -- before security ultimately separated them.