I was masturbating, then my penis popped, it got all yellow and purple, i went to go to the bathroom and i had blood instead of urine. what do i do?

Go to the ER: As it sounds like your significantly traumatized your penis and need to be evaluated by a urologist ASAP

Need eval: You need to be seen by a urologist. It would seem you broke a vessel in your penis. It may be as simple as ice to the area and watchful waiting or perhaps more involved. You need to see a urologist for evaluation asap. Dr R