“Goodbye, cruel world” has been the title of several songs and has been printed on many images. It is what someone might say before committing suicide.
 
“Good-bye, cruel world” was written in an alleged suicide note printed in the St. Louis (MO) Daily Globe-Democrat on August 5, 1875, and the Chicago (IL) Daily News on September 26, 1879.
 
“Good-bye, cruel world” is such as cliché that it is more often used for comic effect to express mock desperation than to express actual suicidal thoughts.
 
“Good-bye, cruel world” has also been spoken before someone takes a shot of hard liquor. “Brother’s giving me a shot of Moonshine from Kentucky… Goodbye cruel world” was posted on Twitter by Soapbox Vizzy on July 21, 2010. “Goodbye, cruel world! #straightvodka” was posted on Twitter by Peach Salinger on February 18, 2012.
   
   
Wiktionary: goodbye, cruel world
Phrase
goodbye, cruel world!
1. An exclamation made before committing suicide, in speech, text, or in a suicide note.
2. (humorous) A call said before taking a stiff drink, especially a shot of vodka.
 
Wikipedia: Goodbye Cruel World
Goodbye Cruel World may refer to:
 
Music
Goodbye Cruel World (Elvis Costello album), an album by Elvis Costello and the Attractions
Goodbye Cruel World (Custard album), an album by Custard
Goodbye Cruel World, a 1999 album by Brutal Truth
“Goodbye Cruel World” (James Darren song), a song by James Darren
“Goodbye Cruel World” (Pink Floyd song), a song by Pink Floyd
“Goodbye Cruel World” (Shakespears Sister song), a song by Shakespears Sister
           
5 August 1875, St. Louis (MO) Daily Globe-Democrat, pg. 2, col. 2:
THE LOST BALLOON.
A Message Purporting to Come from Donaldson Found in a Bottle On the Lake Shore.
[From the Chicago Journal, 2d.]
(...)
The messenger sent to Mr. Chance brought another paper, found in another battle near the same place, and hour and a half after the first was found. It reads as follows:
 
Died in the Lake, Peter Coone, on the night of July 15, ‘75. Sailed on a log for twenty-four hours. Hungry as blazes. Good-bye, Cruel World.
 
26 September 1879, Chicago (IL) Daily News, pg. 1, col. 5:
THE CITY.
Disappearance of a Musical Composer.—Robert Mills, a musical composer, for several years past employed by Huck & Hill, music publishers, disappeared on Monday, and it is feared has committed suicide. Mr. Hill found the note, addressed to the firm, yesterday:
 
“I do hereby bequeath to Messrs. Huck & Hill all right to use and published these enclosed hymn tunes. They are the very last that I shall write prior to leaving this world of misery and woe.
 
“I have tried very hard to get something to do, but have failed every time, and I have grown weary in the utter unrealization of all my hopes and expectations. Good-bye, cruel world. I leave you for another that, although I know nothing concerning it, cannot be worse than this. Yours,
ROBERT MILLS
Sept. 22, 1879.
 
27 September 1879, St. Louis (MO) Daily Globe-Democrat, pg. 2, col. 3:
GOOD-BYE, CRUEL WORLD.
The Legacy Left by a Disheartened Musician.
(Same story as above.—ed.)
   
16 June 1914, Lincoln (NE) Daily News, pg. 2, col. 4:
GOODBYE, CRUEL WORLD
READS NOTE IN BOTTLE
DENVER, Col. June 16.—“Goodbye cruel world. I have so much money I can’t buy my flea enough to eat. So he died. Bury me in a rubber coffin, so I can go to hell a-bouncing.”
 
Twitter
Soapbox Vizzy
@VaryusWaise
Brother’s giving me a shot of Moonshine from Kentucky… Goodbye cruel world.
11:06 PM · Jul 21, 2010·Twitter Web Client
 
Twitter
Peach Salinger
@KevinTWright
Goodbye, cruel world! #straightvodka “
@DevonCan: I present the world’s largest shot! (Vodka Gimlet made at Quinton’s) https://pic.twitter.com/5qiCaxx”
12:03 AM · Feb 18, 2012 from Lawrence·Twitter for iPhone
   
Twitter
space.ghost
@KuKluxKundall
Only one shot of vodka left; this is my suicide note. Goodbye cruel world.
            Sincerely, Alex
4:16 AM · Feb 8, 2014·Twitter for iPhone
 
YouTube
James Darren - Goodbye Cruel World
MAJESTIC JUKEBOX
Published on Oct 20, 2015
James Darren - Goodbye Cruel World (1961)
   
YouTube
Goodbye Cruel World
Pink Floyd
Published on Jan 8, 2016
Provided to YouTube by Pink Floyd
Goodbye Cruel World · Pink Floyd
The Wall
℗ Pink Floyd Records
Released on: 1979-11-30
 
Twitter
WeForgot
@WeForgot3
Gonna switch out my water for vodka and every time this coworker says “it is what the cool developers do” I am gonna take a shot. Goodbye cruel world
9:52 AM · May 17, 2019·Twitter Web Client