bush week

Etymology
Apparently from an actual attempt to organise a Bush Festival in Sydney in 1919; the idea then being extended to the present figurative use.

Noun

 * 1)  An imagined or symbolic time when assumedly unsophisticated people from the countryside come to the city, likely to be preyed on by tricksters there, or who are unaware of social norms in the city.
 * What do you think this is, bush week? (= What do you take me for? / Do you think I'm an idiot?)
 * What do you think this is, bush week? (= Why are you not working? / why are you not doing what I asked you to do?)