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anyone who dates a Pregnant woman to later steal her placenta and sell them to other Placenta sharks, rice sharks, mud sharks, or bean sharks.

A term shouted during a game of beer pong to cause the opposing team to miss their shot horribly due to extreme amounts of laughter.
"Why are you dating that pregnant chick? Are you a Placenta Shark!"

"Shoot the damn ball you Placenta Shark!"

by Yvonne ginger August 28, 2008
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