Top Definition
In ancient times, Australian Aboriginals would only keep one baby when twins were born in a tribe. The weaker looking baby was left to die in the hot sun. This was done to be more efficient as they didn't want a mother to support and feed 2 babies. The baby that was left to die was called the 'Pidna Twin'.
"Hello, I see you're twins. Which one of you is the surviving Pidna Twin?"

"My friend just gave birth to twins! I wonder which one she'll choose to be the Pidna? It's a very hot day so it will pass away quickly."

"I have a twin sister. I was the Pidna Twin, but I managed to survive the hot sun and make a life for myself."
by oztrayleah September 26, 2012

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