
Pantsing refers to a style of writing whereas one makes the story up as they go along. It’s part of the trinity of methods, the other two of which are planning and plantsing. Planning the story is just what it sounds like — from using an outline of each chapter to setting up scenes and documented world-building. Plantsing is somewhere between the chaos of making it up spontaneously and organizing everything.
Normally I am a plantser — I have “note cards” (a feature on Scrivener, the program I recommend for writing novels) for each chapter denoting what should happen in the chapter, and I see where those directions and the characters take me. But this time around, I have diverged from the note cards enough that I am most definitely pantsing.
For example, I was writing about how my characters in their collective (think commune, sort of) were going to cope with the potential for communications and shipping breakdown in the oncoming breakdown of American society, and I thought about replacement parts and fuel for the farm. While I was in the middle of writing that, I thought, “Oh my god, what are they going to do about the staple goods they don’t grow themselves?” The collective eats a certain amount of bread, for example, but they don’t raise the wheat themselves because only the wrong type of wheat grows in the Midwest. In addition, they’re vegetarian and bought rather than grew their legumes. They use their farm land for more suitable items for the collective, like fresh fruits and vegetables, as they could always buy the staples through the local food co-op. So they suddenly figured out they could have a food crisis. In striving to be self-sufficient, they blinded themselves to the fact that they were not self-sufficient, any more than other humans. They discovered this at the same point where I thought about it, of course.
I may edit this later, putting the food crisis before the capital goods crisis chronologically. But I may not, because if it occurred to me in that order, maybe it would have occurred to them in that order. Maybe the capital goods crisis they envisioned was the one the collective saw most clearly* and therefore first. Part of the process of pantsing is the harder job of editing down the line.

It’s been a wild ride writing this novel so far. I feel like I’m climbing a rock wall without a belayer. If I felt a lot better about my rock climbing skills, I would not feel like I needed belaying.** Ah, well. See you at the edit.
* This is known in cognitive psychology as the availability heuristic, whereas we believe the most readily imagined scenario is the most likely or important one. This heuristic is why young people buy life insurance and not disability insurance despite being 7 times more likely to die than to become disabled.
** I just about used the word ‘balayage’ here, which is a hair-dyeing technique. Oops.