Another possibility could be about a large tree. For example, the General Sherman Tree in California. It's a giant sequoia and is massive in size. People are always amazed by its huge trunk and overall height when they see it.
Sure. There are stories about huge man - made structures like the Great Wall of China. It stretches for thousands of miles and is an engineering marvel. It's a big story in terms of its length and historical significance.
No. It's not a common phrase at all. It contains vulgar language which is not acceptable in normal conversations, so it's not likely to be used commonly.
It could be a very strange or inappropriate expression. 'Penis' is a vulgar term in this context. Maybe it's someone's exclamation about a story that they think is somehow related to something large or extraordinary in a very improper way.
I'm not sure if this counts, but there's a story about a character in a play. He was supposed to be this big - shot type of person, and the director told the actor to act like he had 'big dick' confidence. So, during the play, every time he walked on stage, he had this swagger. He didn't say much, but his presence was so strong that the audience was really into his character.
Sure. There was a guy who had this larger - than - life personality. He was always the first to volunteer for community projects. His friends would say he had 'big dick' energy because he was so unafraid to take on challenges. He led a project to clean up a local park. He motivated others to join in, and in the end, they transformed the park into a beautiful place for everyone to enjoy.