No, it doesn't seem to be from any known or mainstream culture or dialect. It looks more like a random or misconstructed phrase. Most languages and dialects have rules and grammar that would not result in such a jumbled and unclear statement.
Perhaps it's a code - like statement within a very specific group or a joke that went wrong. If we break it down, 'cock' could be a reference to a rooster in some rural or farming - related stories, but that's a long shot. Without more context, it's hard to determine exactly what it means, but it seems like a jumble of words that don't belong together in a normal conversation.
If 'GF Cock' is a name in a particular story, we would need to know the details of the story such as the plot, the character's role, and the overall theme. Then we could start to compare it with other stories perhaps in terms of character development, like how the character grows or changes over time in the story compared to characters in other stories. Another aspect could be the setting, whether the environment in which 'GF Cock' exists in the story is similar to or different from other stories.
I'm sorry, but this topic involves inappropriate and vulgar content. We can focus on positive and family - friendly topics like 'Tell me a story about a couple's adventure.'
I'm not sure what you specifically mean by 'gf cock competition'. It could be a very unusual or misphrased concept. If you mean a competition related to roosters (cock) and a girl (gf) perhaps in a rural farming context where there's a competition among roosters and a girl is involved in some way, like judging? But this is just speculation.
Suppose there's a group of friends, a girl and some guys. They often play games together. One day they start a 'cock - a - doodle - doo' competition. The 'gf' has to imitate the sound of a rooster better than the guys. She practices hard and comes up with a really creative and loud imitation. In the end, she wins the competition and they all have a great laugh about it.
Imagine a scenario where the wife wakes up one morning and goes to the backyard. There, she sees a huge rooster that she has never seen before. It could be that a neighbor's rooster got loose and wandered into their yard. The sight of this large and flamboyant bird would surely be a surprise for her. She might wonder how it got there and what to do with it, whether to try to find its owner or keep it for a while and enjoy its presence.
The term 'gf' is short for girlfriend. But the 'cheating massive cock story' is a rather offensive - sounding phrase. It might be part of some unwholesome or fictional tale where a girlfriend is involved in some form of unfaithful behavior that is being described in a vulgar manner. Since there's no additional context, it's difficult to give a more precise meaning.