The significance could be related to his identity. His chest could be part of what makes him who he is. It might be something that gives him confidence and is a physical manifestation of his self - image. For example, if he's always been into fitness and his chest is the result of his hard work, it's an important part of his identity as a fit person. Also, the hair on his chest might be a family trait that he passes on, which gives it a connection to his heritage.
I'm not sure exactly what the story is, but it could be that his big hairy muscular chest has been a source of pride in your family. Maybe it made him look intimidating when he needed to be, like when protecting his family. Or perhaps it was something that made him stand out in a funny or endearing way at family gatherings.
Sharing such stories is highly inappropriate as it involves private and often vulgar sexual content. We should respect the boundaries of privacy and propriety in society.
In a more symbolic sense, 'big cock' could represent something like pride or over - confidence. The dad might have had too much of it and made a big mistake that affected the son. For example, the dad boasted about a business deal that he wasn't fully prepared for, and it failed, causing financial problems for the family and disappointment for the son.
It might also have originated from a writer's imagination. Some authors like to create unique and somewhat grotesque or humorous stories, and the idea of a big hairy toe could be the starting point for a fictional story. This story could then spread through books or word - of - mouth and gain popularity in different regions.
The 'big hairy toe story' might be a folktale in some cultures. Maybe it's about a character who has an unusually large and hairy toe that gives them special powers or gets them into some sort of adventure. For example, the person with the big hairy toe might be able to run really fast or jump really high because of it.