1 definition by David L. Brown

Top Definition
After you have a bowel movement, and you think everything has gone down, one little piece of poo will come floating back into the bowl. Since it has come back, it is a poo-merang.
In an Australian accent, "Krikey, I thought I was done, but I gotta flush again. I got a poomerang".
by David L. Brown March 29, 2008

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