Grace Period 

The sweet but brief time after sex where the man is no longer horny.

I read a book yesterday while John's grace period was going on.

Grace Period by Your_mothers_yoga_instructor April 4, 2015

Friend Request Waiting Period

The time after someone requests to be your friend on Facebook or some other social media site. This is a lag period in which the invitee receives the offer, contemplates, evaluates the person's looks, number of mutual friends, other hot friends, and general demeanor before accepting the request. This period is very similar to the "two day rule" when getting someone's digits. By stretching the friend request waiting period ever so slightly, it appears that you are not so desperate for a new friend addition.

Guy 1: "Yo I just became friends with this smoking hot chick other day. You should add her and look at her photos."

Guy 2: "Already tried to add her after I saw you became friends with her. She hasn't accepted my request yet."

Guy 1: "Damn. You must be in the friend request waiting period.... good luck with all that."

Friend Request Waiting Period by JoeyBats August 21, 2011

Facebook Denial Period 

The period between when a couple ends their relationship, but neither one of them changes their relationship status on Facebook, thus alerting the news to all their friends.

"Oh man, did you hear Jack and Kate broke up?"
"No? They're still together on Facebook?"
"Hmmm, must still be in the Facebook Denial Period"

Facebook Denial Period by Edinburghssuiteheart August 19, 2009

honeymoon period 

The three-month maximum period between a person's entry into a new situation and a person's complete screwing up of said situation or essential elements of it. This phenomenon is backed by massive amounts of studies in social psychology and even more massive amounts of personal testimony from bitter, angry people.

Susannah just broke down and gave her new roommate specific instructions on where she would prefer her to travel on her next vacation. That honeymoon period is over.

honeymoon period by TheLastPunslinger May 15, 2005

Nerd Period 

That time of the month when you feel particularly nerdy. Often characterized by sudden emotional outbreaks of nerdiness and demands for unreasonable amounts of certain video games or music. No nasty bodily functions involved; a possible exception of less showering may occur, however.

Person 1:
"I think I am on my nerd period.... I played Goldeneye for like 25 hours yesterday, and there aren't even 25 hours in a day. How is that even possible.. with except... maybe... holy shit... person 2! do you know what this means?! I have accidentally slipped into the Starbucks time continuum..and... and......"

Person 2:
O_o

Nerd Period by Chuck Deliverer August 4, 2008

Poo period 

the pains of the lower abdomen experienced during constipation or during a nasty bout of food poisoning

backpacker A- "damn, I'm doubled over with a poo period here"

Bakcpacker B - "Yeah, that'll be those deep fried tarantula gonads you had off that dodgy looking street vendor mate"

Poo period by hilaire December 25, 2011

Murphy's Law of first period 

If you haven't done homework for a class, you will have it first period without fail

Guy 1: Ah fuck dude, English first... of course I didn't write my essay.
Guy 2: Well yeah dude, murphy's law of first period

Murphy's Law of first period by dangdaddddddyyyy November 9, 2016