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Bunch of teenagers going into a forest or large area of "bush" and partying.
"Hey Joe, Bush Bash tonight" ?

"Yeah dude, I'll bring the booze !"
by Abid. A May 29, 2006
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2
An Australian term meaning to beat through thick bush, perhaps with a stick, usually off the marked track, whilst bush-walking.
"There is a lake over there, but you'll have to bush-bash to get to it."
by sarlaughalot August 25, 2008
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