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A rumped up piece of steak is a old womans vagina that has been done over to many times. The woman is usually proud of her adventures and is pleased with her wide Holy Grail.
"Have you seen that fellas Nan I heard shes got rumped up piece of steak"

"I know and shes proud of it. I heard her husbands a porn star he's called Pepper Wigsel."
by Milo Cude November 03, 2009
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