An enthusiatic exclamation of inquiry or disbelief which is an acronym that stands for "Where Dey Do Dat At?"
If someone does something lame, out of the ordinary, or if something is out of the norm; similar to who the hell does that?
"Frank has on high-water skinny jeans and white penny loafers. WDDDA?"
When using Twitter or Text use #WDDDA or WDDDA to maximize your 140 and/or 160 characters. Thats All.