The bragging crosstalk was a traditional form of Chinese crosstalk. It told stories in an exaggerated and humorous way, often involving exaggeration and bragging. Crosstalk actors displayed their eloquence and sense of humor through dialogue and comparison. " Big Talk " was a classic crosstalk segment. It told the story of a grasshopper and a cricket bragging about their abilities to each other, but in the end, they were eaten by a rooster. The lyrics of this joke were very interesting and were often used by actors to show their acting skills and sense of humor. Gao Feng and Luan Yunping from Deyun Society were famous crosstalk actors. They had also performed the joke of " Talking Big." Generally speaking, crosstalk was a part of traditional Chinese culture. It used humor to make the audience laugh nonstop.
Definitely not. In normal English usage, we don't come across such a phrase. It might be a very specific family or individual - created phrase that has no common or widespread usage in the English - speaking world.
One should firmly but politely ask her to stop. If possible, also try to find out why she is engaging in such behavior. Maybe she is not aware of the inappropriateness. If the situation persists, it might be necessary to seek help from other family members or a family counselor to address the issue.
Well, in the 'big mom is luffy's mom fanfic', they might have crafted a story where Big Mom is Luffy's mom. But it goes against what we know from the official 'One Piece' story. Fanfictions like this can be really interesting as they can rewrite the story in unexpected ways. They might have some interesting plot twists and explanations within the fanfic to justify this relationship, but it's not part of the main 'One Piece' universe.
The phrase is rather odd. 'Ducking' might be a wrong usage here instead of perhaps 'duck' or something else. Maybe it's a family story where there was some confusion about a duck and a rooster, but this is just speculation without more details from you.
That's inappropriate behavior. You could try to have an honest conversation with her. Let her know that you are uncomfortable with such stories and ask her to stop.
Such a situation is highly unconventional and not a topic for normal conversation. It goes against common moral and ethical standards and is not something we should be focusing on or encouraging to talk about.
One possible plot implication could be a change in Luffy's power source. Since Big Mom has such unique and powerful abilities, Luffy might inherit or be related to some of those powers in the fanfic. Maybe his Devil Fruit ability could be related to Big Mom's in some way.