Autismsplaining is when one presents another with information that they are likely unfamiliar with in a very in-depth and technical manner. The word is derived from the tendency of people with ASD to give long-winded dissertations on topics that others aren't very well versed in.
Autismsplaining usually involves specific, technical jargon and lengthy explanation that the listener is unlikely to understand.
"Yeah guitars are pretty cool. My favorite shape is the Gibson SG body, but in terms of actual playability and function, I prefer the ESP Viper series. Gibson's had a lot of quality control issues and lack of innovation, and I think that the better pickup design with a coil-splitting option is far superior to any Gibson product, while still retaining the iconic design."
"Dude, you're autismsplaining. I barely understood any of that beyond you liking guitars."