Dame Edna was a guy dressed in drag named Barry Humphries.
From Australia he had a big breakthrough in North America for a short period of the before people grew tired of his antics.
I suppose it's comparable to fellow Aussie Paul Hogan's (Crocodile Dundee) success above the equator...except he wore pants below the equator.
Youtube: By request, the third part of Dame Edna's Hollywood, broadcasted on 9 May 1992 in the US, with guest Chevy Chase, and also with George Hamilton, Burgess Meredith and Ringo Starr. It was broadcasted again by Dutch VARA television on 30 May 1992 (English spoken, Dutch subtitles).