This one didn't technically happen during an NBA contest, but it involves Darko Milicic, a player most famous for being a huge NBA draft bust.
This hyperlink contains a link to the video, but be warned that it contains quite a bit of profanity.
Here's a transcript of the translated interaction between Milicic and a reporter after a contest between Greece and Serbia in the 2007 Eurobasket Champonship:
Reporter: "Darko Milicic! What are your first impressions from the game?"
Milicic: "Nothing. These three s**t head referees have stolen us a victory. That's what happened. These three p*****s, these three s**t heads think they're something. I am gonna come back and f***k their mothers to all of them. That is my message to them. P*****s! And to this Italian p***y, I will fuck his mother. That's what I'm gonna do."
Reporter: "Darko, calm down. Tell us about your impressions."
Milicic: "S**t heads! Suck my d**k! You can write that. All three of them, I don't give a s**t about it. They were frightened and did not whistle anything. I am gonna f**k their mother in her mouth. I'm gonna f**k them all and if he has a daughter I'm gonna f**k her too."
Reporter says something unintelligible.
Milicic: "Look at me, we're fighting at the ground. I'm getting pissed off now. And they steal us like s**t heads. That's all."
Yeah...I think this qualifies as a temper tantrum.