LA Clippers Sued -- $5 MILLION FOR SPAMMING FAN ... Allegedly

An L.A. Clippers fan is suing the team .. claiming the NBA squad is responsible for SPAMMING his cell phone ... and now he wants them to pay up, to the tune of $5 MILLION.

The guy behind the lawsuit is Ari Friedman -- who claims he went to a game at Staples Center and participated in one of those arena games where you can send a text message to the team that could get posted on the stadium scoreboard. (Sidenote: Who does that???)

In a lawsuit, obtained by TMZ Sports, Ari claims the team assured fans they would not share cell phone information or send return text messages ... but alas, Ari claims the Clips broke that promise

After the game, Ari says he got hit with text message spam which traced back to the Clippers. He's pissed because incoming text messages can cost several cents in charges.

Now, Ari's filed a class action lawsuit demanding $5 million from the team for his troubles.