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!"