The disgraced comedian, who is serving time behind bars for drugging and raping Andrea Constand in 2004, shared the bizarre message on his official Twitter and Instagram accounts.
It began: "Hey, Hey, Hey...It's America's Dad."
The tweet appears to be in reference to Cosby's role as family man Cliff Huxtable on the top-rated The Cosby Show from 1984 to 1992, for which he became known as "America's Dad".
"I know it's late, but to all of the Dads... It's an honour to be called a Father," he continued.