menstrual steak

A large portion of meat (usually beef) consumed by a female immediately before or during her menstrual period.

This is a particularly noteworthy phenomenon in women who usually do not consume much meat or in vegetarians who clandestinely indulge in monthly hormone induced carnivorous cravings.

A: *gasp* 'I thought Mandy was a vegetarian!'
B: 'She's on her rags. Give her a break!'
A: 'Ohhhhh... She's having a menstrual steak. My bad. I guess I won't mention it next time I bump into her and her vegan hipster boyfriend.'