“What do you call a depressed cow?”/“An emoo.”

A cow riddle is:
 
Q: What do you call a depressed cow?
A: An emoo.
 
“Emoo” is a pun on “moo” and “emo,” as well as possibly “emu.” The joke was posted on Twitter on August 1, 2010.
 
   
Wikipedia: Emo
Emo /ˈiːmoʊ/ is a rock music genre characterized by an emphasis on emotional expression, sometimes through confessional lyrics. It emerged as a style of post-hardcore from the mid-1980s hardcore punk movement in Washington, D.C., where it was known as emotional hardcore or emocore and pioneered by bands such as Rites of Spring and Embrace. In the early 1990s, emo was adopted and reinvented by alternative rock, indie rock and pop punk bands such as Sunny Day Real Estate, Jawbreaker, Weezer and Jimmy Eat World. By the mid-1990s, bands such as Braid, the Promise Ring and the Get Up Kids emerged from the burgeoning Midwest emo scene, and several independent record labels began to specialize in the genre. Meanwhile, screamo, a more aggressive style of emo using screamed vocals, also emerged, pioneered by the San Diego bands Heroin and Antioch Arrow.
 
Wikipedia: Emu
The emu (Dromaius novaehollandiae) is the second-largest living bird by height, after its ratite relative, the ostrich. It is endemic to Australia where it is the largest native bird and the only extant member of the genus Dromaius. The emu’s range covers most of mainland Australia, but the Tasmanian emu and King Island emu subspecies became extinct after the European settlement of Australia in 1788. The bird is sufficiently common for it to be rated as a least-concern species by the International Union for Conservation of Nature.
 
Emus are soft-feathered, brown, flightless birds with long necks and legs, and can reach up to 1.9 metres (6.2 ft) in height.
     
Twitter
V. S. Wells‏
@vsmwells
What do you call a depressed cow? An emoo. What do you call a cow who’s offended you though that joke was crap? ANGRY.
4:15 PM - 1 Aug 2010
   
Twitter
Connor Malone‏
@ConMal1
What do you call a depressed cow? An emoo
5:02 PM - 7 Feb 2011
   
Twitter
Hafiz Hafiz Ashley ☮‏
@HafizA5hley
Haha, What do you call a depressed cow? Emooo
7:41 AM - 9 Jun 2012
   
Twitter
syndrome of a down‏
@k4nkles
what do you call a depressed cow? AN E-MOO @c0nfabulate
5:53 PM - 21 Feb 2013
     
Twitter 
nick‏
@tropicamiIa
what do u call a depressed cow?
an emoo
6:51 PM - 8 Apr 2013
 
Twitter
ad‏
@Miss____Queen
what do you call a depressed cow ?
e-moo
3:16 PM - 26 Oct 2015
   
Twitter
Shroat‏
@melonsack
What do you call a depressed cow? Emoo! HAHAHAHAHAHHAHAHAHHA
3:42 PM - 7 Jun 2016
 
Reddit—3amjokes
What do you call a depressed cow? self.3amjokes
Submitted February 3, 2018 by Aavenell
Emoo.
COMMENTS
QuintonTrembly
Emu? https://imgur.com/a/Pkb9k
 
Twitter
3AM‏
@3AM_Jokes
What do you call a depressed cow?... Emoo.
8:27 AM - 3 Feb 2018