meme

Meme is an artform, in which images, drawings and texts, that (becomes popular by the population of the internet) have some reference in it, which most people can relate to. This is not a rule, anything can be a meme, but it must be made public on the internet and it has to be unique, never seen before. Modern, new memes last no more than 2 weeks. This was not a case many years ago. Also, explaining a meme RUINS IT, so if you're friend is new to this, give him links, and say as little as possible to not ruin it.

Me: Omae wa mou shindeiru (You're already dead)
Friend: Nani(What)?! *his head explodes*
This is a meme (reference) (single line) from one old anime about most badass, overpowered character, Kenshiro of the North Star.