Bob Saget spoke about changing the diapers of the Olsen twins. Credit: D Dipasupil/FilmMagic

Full House father figure Bob Saget sure took daddy duty to a whole new level! 

Saget, 57, played Danny Tanner in the '90s sitcom, the father to daughters D.J., Stephanie, and little Michelle, played by both Mary-Kate and Ashley Olsen. In his new book, Dirty Daddy: The Chronicles of a Family Man Turned Filthy Comedian, Saget confesses that he wasn't just putting on a show for the cameras when it came to taking care of the Olsens. 

The twins, who shared the role of the youngest daughter due to child labor laws restricting the hours required for filming, started acting in Full House at just nine months old. Their young age meant there were dirty diapers to be changed on set -- a role Saget readily took on.

"Cameras were rolling and one of the young ladies had made a poop, which had to be removed or we would have been holding a child with a smashed-poo-filled diaper for a long scene," Saget reportedly wrote in the book. "A very long scene if you’re smelling poo the whole time."

Saget, who has maintained a close relationship with the now 27-year-old sisters, said back in 2010 that he happily reminds Mary-Kate and Ashley of the favors he did for them. "The joke I have with them is that I diapered them," he told Pop Eater. "They were three months old and doing the show and I also had a baby and there was a time when I knew how to diaper them really quickly."

The funny man has three daughters with his ex-wife Sherry Kramer. His oldest, Aubrey, was a baby when the show started, while his second daughter, Lara, and youngest, Jenny, were born during the show's filming. 

In stores now, Dirty Daddy also touches on Saget's relationship with his Full House co-star John Stamos, his stand-up comedy career, and his personal life.