I'm pretty sure that song is a blatant ripoff of "Regular Everyday Normal Guy" which predates it by about a decade. https://www.youtube.com/watch?v=5PsnxDQvQpw
It was indeed from Jon Lajoie, but not the song you link. It looks like he did a followup track called "Everyday Normal Guy 2" which includes exactly the loop you hear (with "motherfucker" and not "guy" in the refrain) everywhere on social media right now.