You might want to watch an episode.... (Score 1)

...before commenting in an ignorant fashion. Since you don't watch the Colbert Report (a show whose very title is pronounced ironically), you probably won't get the irony of a word like 'truthiness'. Slang has always been a hugely important part of English, and the new slang isn't any better or worse than the slang you learned when you (ostensibly) learned the language. I actually find British slang to be more bizarre and faddish than the American sort, even that which comes from rap music / American black culture.