When you've had a couple bills or debts for a very long time and instead of decreasing the debt keeps getting larger they take on the term the "Williams" because over time your bills keep growing.
also called (The Williams)
"hell, man.... my bills are so old I'm starting to call them Willams now!"
"whats good homie? lemme borrow a few bucks"...."sorry man I wish I could, I got a bad case of the williams"
When you young you ain't got that much responsibilities and things to pay for but get older and get that mortgage, that car payment, that insurance payment.....my bills done grown up so much I can't even call them by their nickname no more, I got the Williams now!