Malarkey

 
Malarkey is empty rhetoric or insincere or exaggerated talk; nonsense; rubbish; or silliness.

I had anticipated that this would be a word of some long-standing origin and was amazed when I looked it up in my two-volume Shorter Oxford of 1983 that the word was not in it. Malarkey, it seems, is slang. I wonder if the latest Oxford Dictionary has accepted it into 'proper' English yet?