"The you know who" is used to refer to someone known to the hearer without specifying their identity. In Harry Potter, the famous movie series, people use "you-know-who" to refer to Lord Voldemort because of fear. People are frightened by the potential danger of calling his name directly.
In the stock market, there's also a man who can affect everything simply by saying a few words.
Let's take a look at what the you-know-who have done.
@razo2: $E-mini NASDAQ 100 Futures(DEC4) (NQmain.US)$
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