Litter Day 

Usually celebrated around Earth Day when the weather is finally nice enough that you are able to drive with your windows down. This invariably causes all of the trash you have accumulated throughout the winter to start flying around the inside of your car until it flies out the open windows at about mach 1.3.

Scott couldn't hardly wait for Litter Day when the inside of his car would finally get cleaned out.

Litter Day by gizzmo96 May 3, 2010

Red Letter Day

1. In the past, special days would be marked with red letters making it a red letter day

2. Any day with personal significance

3. A day that you make someone else's day wonderful through various ways

1. Oh look, it's the queens birthday tomorrow. Better get ready for the red letter day!

2. Oh look, my girlfriends birthday is coming up. Better get ready for the red letter day!

3. I went with my girlfriend shopping and bought her everything she wanted, then we had a candlelit dinner and finally, I sang her to sleep under the stars. All of this because it was her red letter day

Red Letter Day by Quicksilver Elegance December 23, 2008

Members of the Church of Jesus Christ of Latter Day Saints 

The Reinstated Preferred name for Mormons as of October 2018.

Person 1: Hey... You're a Mormon!
Person 2: *Sigh* No... We are Members of the Church of Jesus Christ of Latter Day Saints.

Members of the Church of Jesus Christ of Latter Day Saints by FungusHughMungus October 29, 2018

red letter day

a memorably happy or noteworthy day

When Jack comes home from his tour of duty, that'll be a red-letter day.

red letter day by johnpqrtst August 3, 2005

National Lifter Day 

March 15th of every year is National Lifter Day. It's a holiday that honors weightlifters. The significance of the date 3/15 relates to 315 pounds (3 plates on each side of a barbell), an important milestone in a weightlifter's journey.

Tomorrow is National Lifter Day, I'm going to max out on bench press.

National Lifter Day by Monday Iron November 22, 2022

latter-day saint 

A member of the Church of Jesus Christ of Latter-day Saints, sometimes called the "Mormons". Believes in the literal resurrection of Jesus Christ, Christ's visit to the Americas; Christ's visit to Joseph Smith; baptism by immersion; morality, truth and justice; avoids coffee, tea, drugs, alcohol and tobacco. The Church has a living Prophet, a spokesman for the Almighty who receives revelation from the Almighty. The Church also has 12 living Apostles who are special witnesses of Jesus Christ.

Latter-day Saints are good neighbors, clean-living, God fearing people who love the Lord Jesus Christ.

latter-day saint by Jay April 19, 2005

black-letter day 

a day on which a great incident of misfortune happened or has happened.

September eleven is a black-letter day in the world history of terrorism.

black-letter day by uttam maharjan March 13, 2010