Word salad
Word salad is a string of seemingly random words and phrases that, while often grammatically correct, lack any coherent, intelligible meaning. In psychiatry it is understood to be a symptom of schizophrenia, but many flat earthers use it as an intentional language technique to create a false perception of intelligence or expertise about a subject, i.e., pseudointelectualism.
Examples
Witsit Gets It
Austin Witsit is perhaps the most well-known pedlar of word salad, and has used it to pretend to understand relativity, electrostatics, magnetism, etc.
Moon phases
Will Duffy: What is a full moon and what is a new moon on your model? Austin Whitsitt: I think it's probably like a magnetic cycle, and just like the center of a ferrocell image of a magnet, it's just completely black. It's actually just pure inertia in the center in the ferrocell image of a magnet. I think that's what it is. It just actually goes into its inertial state and charges back up and once it becomes, like, aetherically displaced again, you start to see it charge up throughout its cycle, and then it goes back. [1]
Plain English translation: When you look at a magnet through a Ferrocell lens, there is a dark area in the middle. The dark side of the Moon is also dark, and the Moon is magnetic magic or whatever, so the two must be the same thing. Also, I don't understand what inertia means. Also, random aether magic. Also, the moon charges up like my phone battery.