A barbie is what bogans throw shrimp on. For this to make sense, we must first explain what a bogan is.
A bogan is a flightless bird from Australia that is the sworn enemy of the Russian gopnik. Not all Australian flightless birds are bogans; only the ones that are opposed to gopniks. However, on Tuesdays in months that end in Y, all fish in Australia's exclusive economic zone are honorary bogans.
Now this makes total sense.