@jupiter_rowland for me I need the name is the meme format so I can search for it on KnowYourMeme if I want to (eg: Hide the pain Harold), and maybe what is implied by it in this specific case (eg: this implies that bla bla is hard and I wish to avoid it), people say explaining a joke is like dissecting a frog but I don't think of it this way.
@jupiter_rowland yeah that's why I didn't say to explain the meme, just a searchable name, and if possible a sentence simplifying what is implied by the use of this meme in this specific case, it can be as simple as "it's implied that so so is bad", and only those who know the meme (or read about it) will know the nuance, and that's fine, the passer by who isn't invested would just know why you chose to use this meme (the summarized meaning it conveys in this specific case only).
@jupiter_rowland what you're meming *about* is something that goes outside the context of the image (and it's alt text), that kind of question would apply to text-only posts as well, it's about "do I explain the context behind what I just wrote?" and I think that's a different thing.
Yeah it would be great if we can always reference the context (a link to a community wiki with all the history), but that's often unfeasible.
@jupiter_rowland To me, alt-text is basically "what would you have to write if you didn't have the ability to attach that image?", kind of undoing the "a picture is worth a thousand words" by writing a summarized hundred words as the alt text.
In the case of memes, they are often used to comedically express a certain feeling or situation (eg: drake meme is to compare a bad thing with a good thing), and that's what I think is good to have in meme alt text.