'amogus' is a bastardized version of the name of the 2018 video game Among Us. The term later gained popularity as a catchphrase used in ironic memes, often used to replace dialogue in cartoons, and as a way of shitposting by spamming the phrase alongside the word 'sus'. Additionally, amogus refers to the simplified drawing of a crewmate from Among Us.
Amogus is a sort of shortening of the word Amongus or Among us. The word originated from the popular game among us in 2020. It has been used to describe the characters in the game.