Shitposting

Shitpost (Also known as Trashposting)
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

1: did you see that shitpost on my tumblr this morning?

2: no, i hate shitposting