A meme is a social virus. Each spreads through a population according to its peculiar viral dynamics — some ricochet through a population and then burn out, while others come and go with the seasons. Every meme is similarly mindlessly replicative. The point of a virus is to replicate, and the point of a meme is to convey a unit of meaning, one that can be easily remixed by anyone.
On the forums and message boards that cater to people who lean politically conservative, though, memes also function as metonyms: Pepe the Frog, a character created by the cartoonist Matt Furie, was claimed by 4chan and has, over the years, gradually morphed into a stand-in for “Trump supporter.” In these spaces, memes also indicate belonging. — https://www.theverge.com/2018/10/26/18029700/cesar-sayoc-democrat-bombs-trump-tank-meme-joke