It was the look that caused her to be known in native bearer and halfcaste circles as 'Mgobi-'Mgumbi which may be loosely translated as She On Whom It Is Unsafe To Try Any Oompus-Boompus.
Where does this one come from? There is a similar expression in one of the Mr Mulliner stories, where the character's name means 'Big Chief Who Can See through the Hole in a Doughnut'.