1. (noun) any content on the internet whose humor derives from its surreal nature and/or its lack of clear context. Differs from a meme
: whereas a meme's humor comes from its repeatability, a shitpost is funny simply because it isn't a predictable repetition of an existing form. Shitposts can become memes, but memes cannot become shitposts.
2. (verb) to create such a post
A person who shitposts is known as a shitposter