Menstrual Blood Chunks; bloody, messy chunks of digusting
excrete from a girl on her period. MBC, a great nickname for someone who does the below.
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.