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."
by Rattyman1964 April 16, 2010
When the anal cavity is penetrated with such viciousness that it pulls the rectal out; creating a hemroid that resembles the top of a muffin that is bloody and crusty with semen.
by Jamoocaba February 5, 2010