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combination of the words “What’s” and “Up” and short for “What’s up” a common greeting term used around the world. Also not specifically used by any 1 group of people , culture, race, or sex.
A slang word used by different young people especaily when saying "hello".
"sup, what's up guys?"
"Nothing."
So most likely the reason your searching this up is
1: Your a freaking idiot
2: Your parent/relative walk into the room and you just searched up Sup
3: Your pure bored
Sup is just cool way of saying hi.
Mark: Sup Angie wanna hang out
Angie: Get a life
Or
Sally: What’s up Stephanie!
Stephanie: I’m moving to California...