Jägermeister  is a German digestif. The Jägermeister label on bottles shows a glowing Christian cross seen between the antlers of a stag.
         
“My spirit animal is the stag. I call him Jagermeister” was posted on Twitter by Wames on February 7, 2012. “My spirit animal is the Jaggermeister stag” was posted on Twitter by Bae-anca on July 25, 2013. “The Jager Stag is my Spirit Animal!” was posted on Twitter by Karen Keyser on August 29, 2013. “The Jagermeister stag is my spirit animal” was posted on Reddit—Oneliners on February 19, 2023.
       
“Grey Goose is my spirit animal” and “Wild Turkey is my spirit animal” are related sayings.
   
The joke involves the term “spirit animal” with a pun on “spirit” (alcohol).
       
     
Wikipedia: Jägermeister
Jägermeister (/ˈjeɪɡərmaɪstər/ YAY-gər-my-stər, German: [ˈjɛːɡɐˌmaɪstɐ]; stylized Jägermeiſter) is a German digestif made with 56 herbs and spices. Developed in 1934 by Wilhelm and Curt Mast, it has an alcohol by volume of 35% (61 degrees proof, or US 70 proof). The recipe has not changed since its creation and continues to be served in its signature green glass bottle.
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Label
The label on Jägermeister bottles features a glowing Christian cross seen between the antlers of a stag. This image is a reference to the two Christian patron saints of hunters, Saint Hubertus and Saint Eustace, both of whom converted to Christianity after experiencing a vision in which they saw a Christian cross between the antlers of a stag.
 
Twitter
Wames
@Wames_Jaters
My spirit animal is the stag.
I call him Jagermeister.
11:12 AM · Feb 7, 2012
 
Twitter
Bae-anca
@b_anchor_
My spirit animal is the Jaggermeister stag
3:45 AM · Jul 25, 2013
 
Twitter
Karen Keyser
@KMK3108
Replying to @Keeleesi
@teKEEL_a The Jager Stag is my Spirit Animal!
7:40 PM · Aug 29, 2013
 
Tweitter
🌞
@littlefinz
my spirit animal is the Jäger stag
11:12 AM · Aug 3, 2014
 
Twitter
RafterManChild
@kevinbry
My spirit animal is Jägermeister.
That counts as a stag right?
5:57 PM · Aug 31, 2014
 
Tiwtter
Juniper Jesus
@JuniperJesus
“My spirit animal is a stag” - someone drinking Jägermeister, probably.
7:31 PM · Dec 19, 2014
 
Reddit—Oneliners
Posted by u/TGBM666 February 19, 2023
The Jagermeister stag is my spirit animal