go bush
1. To embrace a simpler, more rural lifestyle, typically by leaving modern city life. My hippie sister really wanted to go bush, but I like modern technology too much to do that.
2. To go wild. The kids will go bush if you let them have all that sugar.
go bush
leave your usual surroundings; run wild. Bush in the sense of ‘wild, wooded, or uncleared country’ became current among English speakers during 19th-century British colonial expansion. In South Africa it may have been adopted directly from Dutch bosch .