When she's on the rag never let her fry the Ragu
Which'll have you under some type of spell crying "dag boo"
Her name on your back in a tattoo

from MF DOOM – Hoe Cakes Lyrics on Rap Genius

Meaning

When shes on her period don’t let her make spaghetti with red Ragu sauce.

She will put her menstrual blood in the sauce, which is a type of Voodoo ritual that would make a man fall in love with a woman. You will be so in love he would get her name tattooed on his back.

Thanks for the lively imagery, DOOM.

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