“Y’allhalla” is a portmanteau word of ‘y’all” (“you all”) and “Valhalla” (a place in Norse mythology). “Y’allHalla” was posted on Twitter on October 19, 2012. “Redneck version of Valhalla: Y’allhalla” was posted on Twitter on April 16, 2017.
 
A riddle was posted on Reddit—Dad Jokes on April 18, 2018:
   
Q: Where do Norse Texans go when they die?
A: Y’allhalla.
 
“Who do Texan Muslims worship?”/“Y’allah” (y’all + Allah) is another “y’all” portmanteau joke.
   
   
Wikipedia: Valhalla
In Norse mythology, Valhalla (/vælˈhælə, vɑːlˈhɑːlə/; from Old Norse Valhöll “hall of the slain”) is a majestic, enormous hall located in Asgard, ruled over by the god Odin. Chosen by Odin, half of those who die in combat travel to Valhalla upon death, led by valkyries, while the other half go to the goddess Freyja’s field Fólkvangr. In Valhalla, the dead join the masses of those who have died in combat known as Einherjar and various legendary Germanic heroes and kings, as they prepare to aid Odin during the events of Ragnarök. Before the hall stands the golden tree Glasir, and the hall’s ceiling is thatched with golden shields. Various creatures live around Valhalla, such as the stag Eikþyrnir and the goat Heiðrún, both described as standing atop Valhalla and consuming the foliage of the tree Læraðr.
   
Twitter
Egypt
@BKMadMan
19 Oct 2012
@AngelaEpley like a true Texan. He’ll be burning with pride and fat ass grin.
   
Angela Epley, CFP®
@AngelaEpley
Replying to @BKMadMan
@bkmadman Y’allHalla (shamelessly stolen from my friend Lori via FB)
6:28 PM - 19 Oct 2012
   
Twitter
J. M. Priest
@fitzgerund
fun fact: when a virtuous redneck dies, he is escorted by hairy-backed, pot-bellied angels on flaming 4-wheelers to the realm of Y’allhalla.
7:06 PM - 8 Mar 2014
     
Twitter
Andrew Tidrick
@awtidrick
Redneck version of Valhalla: Y’allhalla
5:26 AM - 16 Apr 2017
   
Twitter
Victoria ⭐️ ⭐️ 🎊  🏳️‍🌈
@starstarparty
Do southern vikings go to y’allhalla when they die?
2:01 PM - 3 Dec 2017
   
Twitter
gender pretender
@vumitt
southerners go to y’allhalla
1:58 AM - 26 Jan 2018
   
Twitter
xXBig_Shuri_Fan_69Xx
@apleasantpossum
when cowboys die they go to y’allhalla
3:36 AM - 9 Feb 2018
   
Twitter
Rangor
@warlockofmars
Legend has it that when a redneck dies with a confederate flag over his head he wakes up in y’allhalla
11:48 AM - 8 Mar 2018
 
Reddit—Dad Jokes
where do norse texans go when they die (self.dadjokes)
submitted April 18, 2018 by awilx
Y’allhalla
 
Reddit—3amjokes
Where do southern Vikings go when they die? self.3amjokes
Submitted April 20, 2018 by OneTerriblePancake
Y’allhalla