Any day that is not your birthday, signifying that each day we are closer to death.
"Happy Deathday to you,
One day closer to
The day that you die,
and your life is through!"
by JoRokHed October 24, 2011
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n. 1. The day you Permanently Failed at life.
2. A planned day of departure from this world
3. When "Hey Guys, WATCH THIS!", didnt end so well
1. Looks like John celebrated his Deathday today.

2. Emo: I am having my Deathday tomorrow if anyone wants to come... not that anyone cares ~boohoo~

3. Jerry: HEY GUYS, WATCH THIS!"
~proceeds to fall and snap neck~
Jerry's so-called friend: Happy Deathday Jerry!
by Dakota ftw, Blake as well March 07, 2009
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A quirky way to describe a funeral or sad day, also used to wish happy birthday without using the words happy or birthday.

Popularized by Youtuber Andrew Huang.
"No food in the fridge? Saddy deathday." "Feeling sad about death, today? Saddy deathday."
by cmm23801 December 14, 2018
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A "Happy Deathday" is when a man or woman is made to down a dirty pint through a party funnel on the day of their birthday, usually to a chorus of their friends singing "Happy Deathday."

If the victim still hasn't finished by the time the song is over then their friends may count to the victims age (in seconds) while continuing to pour any non-toxic liquid they can find into the funnel.
Jordan: "The last thing I remember was not being able to finish my Happy Deathday in time, everything after that is a mystery."
by Captain Faceplant September 02, 2009
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