1) An outside privy 2) Outhouse 
Dunny or dunny can is Australian slang for toilet, either the room or the specific fixture, especially an outhouse or other outdoor toilets. It is often used to specify a distinction between a flushing toilet and a non-flushing toilet (e.g., a longdrop or thunderbox). First used in print in 1952, the word is believed to be derived from the much ol...[toy] A Dunny is a type of vinyl designer toy created by Paul Budnitz and Tristan Eaton, and produced by Kidrobot since 2004. The toy is based on a rabbit figure with distinctive tubular ears. The origin of the name Dunny came from a combination of street slang and one of the early `Devil Bunny` prototypes. The Dunny is sold in 3-, 8- and 2...
• (a.) Deaf; stupid.
Dun'ny adjective Deaf; stupid. [ Prov. Eng.] « My old dame Joan is something dunny , and will scarce know how to manage.» Sir W. Scott. 
Outdoor lavatory.
Outdoor lavatory
an outside privy; outhouse.
outside lavatory