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A grand old tradition in which a female will take a picture of her titties and send it to a spouse/boyfriend/fuckbuddy/celebrity/or just a lucky random person if it is their birthday. "Happy birthday" may or may not be written across the hills.
"Hey what did Sarah give you for your birthday?"
"I'll show you"
"YOU GOT BIRTHDAY BOOBS?! Damn you are lucky and she is a keeper. Dynamite nips by the way."
by goldstaylives November 12, 2013
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Australian tradition where the birthday boy must see boobs on his birthday, or he will be haunted by bad luck for the next year.
Simon didn't get any birthday boob, so didn't get into college the following year.
by greenacres9741893 July 06, 2015
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