That act of licking a girl's asshole (missionary) while she is menstruating.
The Dirty Rudolph
"She told me she couldn't have sex because she was on her rag, but I still went down on her Dirty Rudolph style..."
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Sit on someone's face with their nose in your asshole, and twist your body side to side, leaving brown marks on their nose.
I'm def gonna give Donna a dirty rudolph tonight.