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When a woman is on her period, her vagina is no longer a pussy, or booty, it transforms into a semi- unusable sexual device called a Bloody Cat which is also referred as the red flag of China, Stop Sign, or panty massacre.
"Hey dude, did you bang that chick last night?"

"Nah man, she was (had a) bloody cat"
by Kasaar March 27, 2007