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1.
1. To kick one's ass; to act forcefully to achieve a desired result. 2. To win or rebut over someone.
Albert: Your such a bogan!
Elizabeth: What!? I'll whoopachang your ass!
by Elizabeth Whoopachanged Albert November 22, 2006
 
2.
1. To kick one's ass; to act forcefully to achieve a desired result. 2. To win or rebut over someone.
Albert: Your such a bogan
Elizabeth: What!? I'll whoopachang your ass!
by Elizabeth Whoopachanged Albert November 21, 2006
 
3.
1.The sound a Blow Off Valve makes when it release's the pressure from a turbocharged car.

2.A car out in Western Syndey that the ladies love.
1.WHWWWHHHAAAAAPPPPPPPPP! WHOOPACHANG!!!!
2.OMG, Lets go for a cruise in the Whoopachang!
by Crashmaeng October 23, 2006