To put emphasis on the word, you say the "o" a little longer and the "u" in "cus" is drawn out, sounding like:
Never used to describe aperson, but objects. The reason for that is a person might think it's an offensive word due to the lack of knowledge in the meaning of the word.
"Your iPod looks rocus."
"That dog's hair is hella rocus!"
"You're hella rocus!"