(plural bush weeks)
- (Australia, informal) An imagined or symbolic time when assumedly unsophisticated people from the bush come to the city, likely to be preyed on by tricksters there.
- What do you think this is, bush week? (= What do you take me for? ; Do you think I'm an idiot?)
Apparently from an actual attempt to organise a Bush Festival in Sydney in 1919; the idea then being extended to the present figurative use.