Tom Segura is opening up on the awful injury he suffered while playing basketball in 2020 ... saying the damage was so bad, he couldn't even wipe his own ass.
The 42-year-old comedian ruined his arm and leg while attempting a dunk during a hoops sesh with fellow funny guy Bert Kreischer ... and if you haven't seen the video yet -- it's worse than you could ever imagine.
But if you REALLY wanna check it out, click here -- but you've been warned. IT. IS. BAD!!!
In fact, Segura even needed a nerve transfer to help fix his arm .