Williams, 32, says his battle with brain cancer is a war he's still fighting, reports WMBF. "When I had my surgery, they got 60 percent of it. The other 40 percent was entwined in my brain," Williams said.
"My 'F' - it stands for fight. Some people look at it as a different word, but I'm fighting brain cancer. I've had it for about 2 1/2 years now."
Williams has had surgery and chemotherapy and spends a lot of time in the hospital. The father of 5-year-old Kameron said "if it wasn't for him and my wife, I probably would have gave up a long time ago, really."
Williams got a letter from the Oklahoma Tax Commission saying he needed to change his "F Cancr" license plates, so he called to plead his case. He says the custom plate is as much a symbol of pride as the scar that runs across his skull.
"I used to try and cover it up with a hat. I tried to let my hair grow out, but it was so patchy it just never worked," Williams said.
"After I told him what the plates said and everything, he got offensive, kind of. He said, 'Oh, I get complaints all the time,'" Williams said. Williams plans to call the Tax Commission again on Monday and explain his situation to a supervisor.
In the meantime, the Facebook page F CANCR Support has been created for supporters of Williams' cause.
Celebrity Families of 2014 [PHOTOS]