a.k.a. because duh

Because "duh" exclamation points are so needy. If you really want to express how something you’ve just said IS SO TOTALLY TRUE, just end it with the quantifier “because duh.” For example, "I would absolutely spend the weekend in a hot tub with Scarlett, because duh."

See also : like  oy vey  
NetLingo Classification: Online Jargon