An erection covered in menstrual blood.
"After coitus, her kid walked in on me in the bathroom and saw my Red Baron."
When you fuck a girl in her bloody pussy then slap your bloody dick on one ass cheek, slip it in her ass, then slap your shitty dick on her other cheek. Then cum in her ear.
Sarah was mad at me last night cuz I ruined another set of sheets when I gave her the Dirty Red Baron.