1 definition by youshouldnotdothat

A particularly heavy flow of blood and sex juices coming out of a woman after she has sex on her menstrual period! The C stands for C#nt. Particularly gross when the man does not know that the woman is on her menstrual period.
John had sex with Betty when aunt flow was visiting and there was a C of Red when he pulled out.
by youshouldnotdothat October 27, 2011
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