There are some seriously hardcore dudes on this list: Badassery: Who is history's greatest badass, and why? - Quora
But I think this is probably the most hardcore:
"...after 12 hours of continual pain, Ramírez sat down on a bench and drank three small glasses of hard liquor. She then used a 15 centimetres kitchen knife to cut open her abdomen in a total of three attempts... After operating on herself for an hour, she reached inside her uterus and pulled out her baby boy. She then severed the umbilical cord with a pair of scissors and became unconscious. She used clothes to bandage her wound after regaining consciousness..."
But I think this is probably the most hardcore:
"...after 12 hours of continual pain, Ramírez sat down on a bench and drank three small glasses of hard liquor. She then used a 15 centimetres kitchen knife to cut open her abdomen in a total of three attempts... After operating on herself for an hour, she reached inside her uterus and pulled out her baby boy. She then severed the umbilical cord with a pair of scissors and became unconscious. She used clothes to bandage her wound after regaining consciousness..."