University of Texas defensive line coach Bo Davis unleashed a passionate and profane rant on a bus full of players after a game this past weekend ... and the whole thing was caught on video.
51-year-old Davis -- who has been a part of 3 national championship-winning programs -- was absolutely fed up after the Longhorns lost 30-7 to Iowa State on Saturday ... apparently reaming the athletes for not taking the beating seriously.
Here's the part that was posted on Twitter, although it's unclear how long the rant lasted:
"S***'s real!