You can't get testicular cancer in the brain.
Lyric: "I hope you get testicular cancer in the brain, dickhead" Song: "Beautiful Pain"
According to the American Cancer Society, testicular cancer "typically develops in one or both testicles in young men, but it can occur in older men as well." Notice this description of the disease does not say anywhere "can originate in the brain," because then they'd no longer be describing testicular cancer, but instead BRAIN cancer. It seems that 2 Chainz is trying to make a reference to the head being a dick, but how this applies to the testicles and brain is unclear. Now maybe if the line went, "I hope you get testicular cancer in the brain, ballbrains" that would kind of make sense, but still. Maybe just don't wish testicular cancer on people, Tity.