Ok, thanks. I was in sub-Saharan Africa, so zero exposure to the Mexican aspects, and I don't recall anyone ever giving a damn about fat content in anything. We also had banana, pawpaw, and guava trees - avos were just one of the standard fruits.
No one answered you about avocado toast, but it's literally what it sounds like. Slice some avocado, put it on toast, typically with a poached egg and some seasonings of choice. It's seen as a quick healthy meat free breakfast or lunch that still has a sort of richness to it. It became a fad with younger people after restaurants realized it could be a real money maker.