Talk:Derpy/@comment-66.195.235.242-20120317171012/@comment-89234-20120319142932

@Ropera: All of the ponies are a little bit different, so there's no problem with that.

"derp" has been used to mean "retarded" (or something similar) by enough people to have a history stretching back for years. It isn't as common these days, but they didn't make it up and then get angry about it.