If she means stories about roosters, you could simply start telling her about the time you saw a really colorful rooster at a fair. Just keep it light and fun.
This phrase is quite ambiguous. It might be misinterpreted as something improper. But if we consider 'cock' in the sense of a male chicken, it could mean she has an interest in stories about them. Maybe she grew up on a farm or just has a strange fascination with chicken - related tales. For example, stories about a rooster that wakes up the whole village every morning could be what she's interested in.
No. In standard English, this is not a correct phrase. 'Cock' has different meanings, but in this construction, it doesn't fit grammatically or semantically with 'wife had a... stories'.
The term 'big cock wife' in a sexual context is not suitable for public discussion. However, if you mean it in a non - sexual, perhaps a misnomer or a made - up phrase in a non - vulgar sense, there are no such pre - made stories. We should stay away from vulgar and inappropriate expressions.