I haven't seen a Quad-Stack Big Mac before, but this looks legit. And apparently the ad translates to "Are you cow enough?". Someone else suggests it translates to “The all-new Supreme Master?”. Hahahah... If BK does the Quad Stacker, why haven't I seen one of these coming out of English-speaking McDonalds before?
From: http://www.signese.com/2006/06/08/are-you-cow-enough/
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SupersizedMeals.com
http://www.supersizedmeals.com/food/article.php/20061218-Quad_Stack_Chinese_Big_Mac