Daddy-o was a friendly term used in 1955 by teenage boys towards their friends. Marty McFly used this term to hastily cover up a slip of the tongue when he called his future father George “Dad” at one point. This article is a stub. You can help Futurepedia by expanding it. Appearances Back to the Future Retrieved from "https://backtothefuture.fandom.com/wiki/Daddy-o?oldid=37569" Categories: Stub Words and phrases 1955 Community content is available under CC-BY-SA unless otherwise noted.