International Come up With a Day Day or (ICUWADD) is that day where you feel "wow my job is retarded" and decide to make up a holiday to miss work. Of course because your job always sucks this makes any day that isnt a real holiday (ICUWADD) and allows you to miss every day of work while still claiming a pay check.
Man: "My job sucks"
Joe: "Thats ok dude, its International Come Up With a Day Day"
Man: "I always forget that everyday is ICUWADD, thanks Joe!"
by nOmega November 10, 2009
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The day when an underage drinker and or alcoholic attains a fake i.d. that says he is over 21, which assumingly the individual already looks like he is over the age of 21.The person’s friends will use the phrase “This truly is a day of days!” before during and after the person has used his brand new fake to purchase alcoholic beverages for his underage friends. The phrase “This truly is a day of days!” comes from the underrated movie The Chronicles of Riddick usually known by heart by the one who is receiving the fake.
Deuce: Hey Tyler do you know what today is!?
Tyler: Isnt it the day scotty gets the fake???!
Deuce: YES! its the day of days!!
Tyler: It truly is a day of days!
by MyFrendsRdrUnk! May 10, 2007
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好好学习 天天向上
good good study day day up
by zhangw April 18, 2014
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An question replaced "Hello" or "Hi" as the most popular form of casual greeting.
And the answer is from Chinglish, means "Study hard and make progress every day"
"What's up? Day day up!" example:

Person 1: What's up?
Person 2: Day day up!
by DWang2k August 11, 2014
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Something happens continually, without interruption or stop.
It is raining from the morning.

Shit! how can we go out when it rains day in day out?
by ArisenAhubudu March 14, 2011
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a relationship which occurs between a set number of days in the week, dedicating several days of the week where a person is considered to be in a relationship, and several days in which a person would be out of said relationship.
person a: let's have a day-to-day relationship
Vishal: okay, how does monday-wednesday work for you?
by samibb May 12, 2009
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