Oomfie boomfie
There's a character in 13 Sentinels who Joe referred to as "oomfie boomfie".[1] This is because there's a genre of gifs that get posted a lot on JADS which depict Klee from Genshin Impact accompanied by text containing the word "oomfie", and Joe probably thought the 13 Sentinels character looked like Klee.
References
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“Falco” video: “Joseph Anderson 13 Sentinels stream 5 with chat [04/04/2023” at 01:49:17].