Commonly used in the phrase, "Oh Noes".
That said, it is a variation of the term, "Oh no", exclaiming that the specific situation is not good and/or unwanted.
"Noes" can also be used interchangeably with the word no.
In Short, "Noes" means "No".
Just an online term.
Noes! Noes! Not True! I Don't Believe it!