To be fair, “brownies with a sprinkling of horseshit” is extremely descriptive yet concise. I understand what this is faster than reading the recipe for what this thing is.
Using another analogy, it's like "vegan lasagna with meat". We all understand what it mean, but once you put some juicy meat there you can't call it vegan anymore.
I like that analogy even better. Adding some shit to a brownie ruins the brownie but doesn't take away it's "brownie-ness" in a sense. On the contrary, adding any amount of meat to a vegan lasagna instantly disqualifies it from being "vegan". There's an element of binary, black-and-white purity that "being vegan" and "being FOSS" have to have.
Non-metaphorically, I highly recommend ordering vegetarian pizza with extra meat. You get a bunch of excellent vegetables and meat to boot! Very delicious.