2. (adj) Used to describe anything which is too cool for outdated words like "cool".
2. That picture is totally sup. Your hair is totally sup. I am totally sup.
Many do in fact actually respond to the question with an answer but quickly disregard it and fray away from it... another way of responding to it would be (Ex 2.)
Ex 2.) "Sup jew?", "Hey man, havent seen your ass in a long time... wanna hang out on Saturday?"