A vagina during menstruation. Failure by a women to inform the person performing cunnilingus that she is on her period.
"Charles forgot our anniversary Veronica, I taught him a lesson by treating him to a 'Blood Muffin' he won't forget that I can tell you."
1 more definition
noun :1) A used tampon 2) adj a dirogitory term directed at someone resembling a cotton swab shoved up the itchy vagina of a rabidly menstraiting woman, then removed and discarded.