Heat Suspend Dewayne Dedmon One Game Over Massage Gun Throw

Miami Heat center Dewayne Dedmon got the boot from a game on Tuesday night ... and it's all 'cause he launched a massage therapy gun onto the court in a fit of rage.

For real.

The bizarre incident happened in the second quarter of the Heat vs. Thunder tilt at FTX Arena ... when Dedmon threw a bit of a temper tantrum following an impassioned argument with head coach Erik Spoelstra.

Video from the game's broadcast shows as Dedmon was walking away furious over the war of words with Spo, he reached down, grabbed a massage therapy device -- and hurled it over fans' heads and near players who were standing by the 3-point line.

Thankfully, no one was hit by the heavyish object ... but everyone on the hardwood was stunned by the incident nonetheless. Refs immediately ejected the 33-year-old over the act.

It's unclear what prompted the explosion from Dedmon -- Spoelstra only said after the game, "We're all a bunch of gnarly personalities ... That part was unacceptable."

It's expected the NBA will hand down further punishment on Dedmon later this month.

Despite the scene, the shorthanded Heat -- who were missing multiple players even before Dedmon's ejection -- somehow pulled off the win over the Thunder, 112-111.