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.
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.
The outcome is kind of ambiguous. Luffy shows great strength and determination but doesn't defeat Big Mom completely. The battle has many twists and turns that keep you on the edge of your seat.
One possible plot could be that Luffy gets into a really tough situation during his adventures, perhaps surrounded by powerful enemies on an unknown island. In desperation, he calls out to Garp for help. Garp, despite his tough exterior, races to his grandson's aid. Along the way, he might reminisce about Luffy's growth and how far he has come.
In addition to Luffy and Garp, other characters could also play important roles. For example, some of Luffy's crewmates like Zoro or Nami might be present when Luffy calls Garp. They could add their own perspectives and reactions. Also, there could be some marines around Garp when he receives the call, and their reactions to Garp's decision to go to Luffy could also be part of the story.
As of now, in the manga, the identity of Luffy's mom remains unknown. There have been many theories and speculations among fans, but no official confirmation.
In the northeast, it was a common way of addressing people as big brother. Northeasterners would usually address strange men as " big brother," especially men who were slightly older than themselves. This was a polite form of address, showing respect and friendliness. For female strangers, they would usually address them as " Sister ". This form of address was more common in the northeast region and was considered a polite and friendly expression. However, the specific way of addressing people might vary according to the region and personal habits.
One possible creepy story could be that when your mom calls you to the kitchen, as you enter, you see all the cabinets open and there's a strange cold draft. The lights start flickering and you hear a low whisper that sounds like it's coming from the sink. But when you turn around, your mom is just standing there with a blank look on her face, not acting like she notices anything strange.
When mom calls you to the kitchen, you find that the kitchen table is set for a meal, but the food is all rotten and covered in maggots. Your mom is sitting at the table, calmly waiting for you as if nothing is wrong. The smell is overwhelming and makes you feel sick.