Ah, ha!  I'll give it a shot with a standard English translation of "That federal property dumbo."  That (meaning the Arizona Memorial) IS Federal property (add comma), Dumbo (as in the children's book or Dummy or Dumb-O as in Dan-O).   In other words, it is not the property that is dumbo (That Federal property IS dumbo)  but the person you are addressing, illustrating the importance of two-letter words and properly placed commas.   Sorry to bore you with my resume.  (Humm, I just noticed QBcoach's comment and could have saved myself the trouble.  Thanks for the translation, Coach, which I eventually figured out was probably derived from Pidgin or some shorthand speech.)