It is an edit of the Markiplier Soyjak which is shown (which itself was derived from a facial expression of Markiplier) to contain some of the Chudjak's features. Then that subvariant, Chudplier, was edited to have a darker skin tone.
also I can admit that what I know about them is useless. Nat is so confident that knowing everything about Planet Dob and Osmosis Jones yet she still thinks she's somehow smarter for that
I mean like years down the line if your employer looks through your resume do you think he'll be more impressed by "profound knowledge of 2001 animated movie Osmosis Jones" or "profound knowledge of internet soyjak trend"
The entire point why I know so much is because I'm bored and knowing a lot about these things is funny. I like chasing rabbitholes on the Internet. And I would also never include this on a resume to begin with.
Incredible gassy isn't even a real soyjak it was forced by just one guy making a bunch of memes about it on a soyjak website and managed to find its way to twitter where it became a viral meme there