Menstrual
Blood Chunks; bloody, messy chunks of
digusting shit that excrete from a girl on her period.
MBC, a great nickname for someone who does the below.
Charlie's drunk ass didn't realize for about 3 hrs that his face was covered in
MBCs(Menstrual
Blood Chunks) from his previous rondevou with his ex girlfriend. Somehow he didn't know that the bitch was on her period and he still gave her head.