Melvin Gordon went head to head with his Uber driver over who's going to win Sunday's Wild Card matchup between his Chargers and the Baltimore Ravens ... and the guy didn't have a clue who he was talking to!
The video's hilarious -- the Chargers stud RB playfully goads his friendly driver to make predictions on the game and ends up getting some spicy trash talk out of him ... especially about Philip Rivers.
After praising Ravens QB Lamar Jackson and basically telling Gordon the Chargers QB sucks, he adds ... "I'm going to pull for Phil Rivers to get up off the ground because they gonna put him on the ground."
The driver also feels confident in Baltimore because they've been playing more as a team now that Flacco's on the sidelines, but clearly ... he doesn't have much info on that Melvin Gordon guy.
Even funnier ... despite making it clear he's pulling for the Ravens, the driver eventually admits he's from Texas, but he's "got to talk that crazy talk" since he's picking up Baltimore residents.
Dude knows how to get that 5-star rating.