LeBron James -- I'm the Bleepin' Champ!!!

LeBron James went full Richard Pryor during his speech at the Cavaliers championship parade ... shocking fans and giving TV censors heart attacks.

We can't recall the King ever dropping even a single 4-letter word on camera, but this time on the mic he let loose -- working the stage like a stand-up comedian -- even though kids, including his own, were watching.