Either having you or your friend rip a bloody tampon out of your vagina by the string and flinging it at an opponent
Bloody beaver cleaver can be fined by example as Arguing with somebody at the bar and having your bestie come over and be like get her girl and she just reaches down and rips the string out and flings a tampon right in the other girl's face
When a girl is on her period, eat her out from behind. When there is enough blood in your mouth spit it in your hand. Then reach your arm between her legs and slap her in the face. Then yell "Headshot!".