User blog comment:P進大好きbot/Ill-definedness of BIG FOOT, Little Bigeddon, and Sasquatch/@comment-36984051-20181204215049/@comment-35134374-20181207210110

Which is smaller than WDUO^^^^WDUO, as the first 2 are ill-defined, but this isn't. See WDUO [//fanmade-googology.wikia.com/wiki/Well_Defined_Utter_Oblivion here].