https://en.wikipedia.org/wiki/Pepe_the_Frog
This is a pretty good explanation.
Basically, it started as just a random joke, but then the left tried to claim it was a symbol of the right being hateful. (Of course the left tries to claim that anything the right does or says is hateful. Because they think they are the arbiters of what is racist, sexist, socially acceptable, etc. and for too long conservatives have been intimidated and defensive. We are no longer playing defense, thanks to Trump!)
Thanks Wikipedia has an extremely leftist view of Pepe and the “Alt Right”.
That lS a good explanation of pepe. Thanx