Love the show, but I don't get the dingo joke... more context needed, as I have never seen that episode.
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The quote, 'A dingo took my baby' comes from the multi award-winning movie, 'A Cry in the Dark', directed by Fred Schepisi and starring Meryl Streep as Lindy Chamberlain and Sam Neill as Michael Chamberlain. The movie is based on the true story of Lindy and Michael Chamberlain whose baby, Azaria, disappeared on August 17, 1980, from the family's campsite in the desert at Uluru - a place sacred to the indigenous people of the area - in the Australian Northern Territory near Alice Springs. Azaria's body was never recovered.
The Chamberlains were tried for the murder of their daughter who, the defense claimed, had been taken by an Australian native dog, a dingo, common to the area. The movie was based on John Bryson's book about these events, 'Evil Angels', and was originally released in Australia under that title.
Lindy Chamberlain wasn't believed when she claimed a dingo had taken her baby. She was found guilty of murder in October 29, 1982, and sentenced to life imprisonment with hard labor. Michael was found guilty as an accessory after the fact; his sentence was deferred.
On February 7, 1986, Lindy was released from prison following the discovery of new evidence: a British hiker, David Brett, was killed in January 1986 in a fall at Uluru; investigating police, searching the area for remains which they feared might have been taken by dingos, found Azaria's missing jacket. This unquestionably proved Lindy Chamberlain's innocence and, on September 15, 1988, all convictions against the Chamberlains were quashed by the Northern Territory Court of Criminal Appeals.
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Answers.com - What movie is the quote 'maybe the dingo ate your baby' from