"Derp" is the correct term these days, I believe

[spudtater]

English Defence League: "We're not thugs, we're a balanced mix of people with an important political message. Now, to prove our point, let's go smash up that truck!!!1! Woooo!! Yeah!"

EDL Protesters Attack Sky News Truck — 09 Oct 2010, Sky News

"Oh... there were journalists in it? Well, I'm sure we made a good impression."