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4th Period 

The parallel universe between lunch and dismissal which seems to slow time down to a fraction of its actual speed.
4th period is like the twilight zone. By the time I got dismissed I ran all the way home in sheer terror.
4th Period by Miles the Magnificent September 16, 2010

retraction period 

The time frame after a penis ejaculates during which the penis will remain soft because of the loss of semen that it has endured. Time length will vary by male.

The male whose penis has just ejaculated will usually want nothing to do with anything sexual until his semen level goes back to normal.
Because he just ejaculated, he's now on his retraction period and wants nothing to do with anything sexual.

ass period 

This is a relitively new disorder where men produce to much blood and ejaculate it out of thier anus. Some may also refer to this as the bloody ass period. It is extremely painful and can occur almost every single day. Corking the butt-hole may result in a bloody eruption of the anal gland and can result it death. The best way to handle the ass period is to let it all keep on flowing and if necessary to insert tampax cardboard into the rectum. The bleeding may either ooze out our squirt like a projectile. A projectile bloody ass period has enough force to rip through even the toughest pair of jeans, so extra protection is vital.
Did you know Carlo had seven bloody ass periods this afternoon.

He left a trail of his ass period down the hallway.

OH NO! I'm getting my ass period.
ass period by The Butt-Bandit September 15, 2007

blue period

similar to a blue moon (two full moons in the same calendar month), two menstruation periods in the same calendar month.
a blue period is having a menstrual cycle on days 1-8 and 29-4, of the calendar month
blue period by aquadump October 4, 2009

Morning Period 

A fake girlfriend/boyfriend someone gets after a big break up, the fake girlfriend/boyfriend is usually used for selfish reasons like sex. the fake girlfriend/boyfriend is discarded as soon as the person finds someone they actually like
Nano: Ed heard you got a new girlfriend, so you got rid of the morning period.
Ed: yup

Carl: hey guys so i got rid of the morning period
Morning Period by BuJebus April 1, 2011

Blue Period

The second period in a month by a woman, named after the "blue moon."
Jeff: Dude, I think she's on her period.
John: Wasn't she on it earlier this month?
Jeff: Uh huh, looks like a blue period.
Blue Period by Psychx October 22, 2012