If it's an unclear or inappropriate usage, you might want to ask your wife more about the context. If it makes her uncomfortable, you could support her by expressing your concern about the content she was exposed to.
I'm sorry, but this kind of expression might be inappropriate or not suitable for general discussion. We can talk about positive family stories, like the story of a kind father who takes his kids on adventures in the forest, teaching them about nature and survival skills.
First, you should try to stay calm. Reacting impulsively can make the situation worse. If it was an accidental sighting, try to forget about it as much as possible.
It could be a very strange and inappropriate situation. Maybe it was an accidental sighting in a non - proper context like at home in an embarrassing moment. However, this is a rather personal and private matter that should be handled with discretion and respect for each other's privacy.
If we consider 'big cock' as a rooster, perhaps there could be a story where an old lady visits a rural area and is surprised to see a really large and magnificent rooster strutting around. She might be amused by its grandeur and the way it behaves among the other chickens. But again, this is just speculation based on one possible interpretation.
Another positive father story could be about a father who takes his child on hikes every weekend. Through these hikes, he teaches the child about nature, how to be brave in the face of challenges like climbing steep paths, and also shares family stories, strengthening their bond.
First of all, you should recognize that this is an inappropriate phrase. Try to forget you heard it. If it was said in a public or inappropriate context, you can distance yourself from that situation.