While John Madden is widely credited with popularizing the term "doink" in football to describe the sound of a ball hitting a goalpost, he didn't coin the term in the sense of being the first to use it. The term "doink" predates Madden's use and is an onomatopoeia - a word that imitates the sound it describes.
However, Madden did use the term flamboyantly during his broadcasts to describe the sound of a ball hitting the uprights, and this usage significantly increased the term’s popularity in the football world.
However, Madden did use the term flamboyantly during his broadcasts to describe the sound of a ball hitting the uprights, and this usage significantly increased the term’s popularity in the football world.