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1.
A Week Where One Can Do Anything Without Hassle
What Do You Think This Is, Bush Week?
by Paul Paul & Stefels March 10, 2004
 
2.
a fictitious (imaginery) week when country people come to town; a time of year when stupid things happen.
(Someone has sone something stupid - i.e leave the door/window open when it's raining, left the milk out on a hot day...etc)

Response: What do you think it is? Bushweek?
by Boniie August 08, 2009
 
3.
Orientation Week for second semester at university.
Bush Week is not an allusion to the colloquialism referring to a woman's genitalia, at least... not intentionally.
by Kit Scheherazade July 17, 2008