Except that it was spelled "roo roo" in the version that Dave Barry popularized...
Now, if we can only figure out the meaning of "Macaca" we'll have it made...
Why, it's clearly an epithet directed at diversity. It sounds like maccaw or Maccau. As we all know these indigenous terms should not be uttered by the undiverse.
And, to top it all off, it ends with "caca," which is foreign for poo. It's all some kind of xenophobic, racist and quite possibly speciesist code, of that there can be no doubt. /s