sup is short for wassup, which is short for what's up, which is short for what is up.
It originated from 2000s teen slang
Sometimes mistaken for "shut up"
it is an interjection, and is used as an informal greeting, such as "what's up?"
sup man
sup. Did you get the ketchup packets?
Originated in Azilda, "sup" can either mean "what's up" like the rest of the world uses it, but, it is also an emotional expression in itself. This expression can be used when you are surprised.
Friend: *sinks a halfcourt shot first try*
Me: "sup"
Friend: *misses a basketball shot when he's 2 feet away from the net*
Me: "sup"
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."