The twenty-eight day cycle between the release of femaleeggs, ovulation.
Tyrone kept Jennifer knocked up every time she ovulated because he couldn't stand the sight of a bloody cunt; therefore Jennifer's menstrual cycle was almost non-existent since she bore Tyrone's child yearly. When she started her periods again after each birth, he knocked her up again to minimize the bloody periods.
The time in wadolesence when the young man regresses to a female likeness. Can develop the following symptoms: Short temperedness, irrationallity, agressive, development of breasts (man boobs), increased sex drive yet a decreased success.
The periodic bitchy moodiness that men go through, which makes them way more irritable than a female going through PMS, despite the fact their piss poor attitude is accompanied by none of the physical symptoms women experience with their monthly cycle