Talk:Derpy/@comment-66.195.235.242-20120317171012/@comment-98.177.152.201-20120322022109

A simple, undefined reply when an ignorant comment or action is made. Brought to life in the South Park series, when Mr. Derp made a guest apperance at South Park Elementary as the chef for a day, followed by hitting himself in the head with a hammer and exclaiming "Derp!"