When your partner is on her period, you proceed to open her vagina very widely and then poop in her. You then have sexual intercourse, mixing the poop and period blood. You lastly eat her out.
1: so did you get it on with your gf last night?

2: no

1: why?

2: because she was on her period.

1: why don't you give her some red matter.

2: whats that?

1: It's where you....

2: JESUS CHRIST MAN!!! That's the best idea ever! Imma go call her now.
by THE MUFFIN MAN November 09, 2012

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