see a man about a wallaby

go to the bathroom.

While it may be used in "Finding Nemo", Mr. Disney (who was deceased, by the way, when "Finding Nemo" was made) did not come up with it. It is an Austrailian saying which was popularized in the movie "Crocodile Dundee".

"Man, that was a great chili dog, but now I've gotta see a man about a wallaby."

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