sup 

The "point" to a "sup" is one trying to say hello, sup was derived from wassup, which is another variation of What's up. What's up isnt an inquiry but an informal way of saying hello, although it can at times be answered with an actual response (Ex 1.)
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 1.) "Sup matt?", "Nothing much just watching gay porn on my computer"

Ex 2.) "Sup jew?", "Hey man, havent seen your ass in a long time... wanna hang out on Saturday?"

sup by Jagged Edge January 5, 2006

Sup 

Of saying "Hello" but slang.

"Sup bro"

Sup by Sup Boss December 17, 2014

sup 

short version of "Wassup", "What's up", or "what up"

Sup cuz, wesside

sup by ac January 30, 2004

sup 

An acronym for "Stand Up Paddling"
A sport involving standing on a surfboard with a paddle.

In Hawaiian it's "Hoe he'e nalu"

Sun is out and the water is calm, want to go SUP?

Let's grab the gear and go!

sup by Planely C July 25, 2016

sup 

1. An abbreviation of "what's up?"

2. A surefire way of killing a conversation before it's even begun.

Bill: Hey.
Ted: Hey.
Bill: Sup?
Ted: Nm, u?
Bill: Nm.

*close conversation window after 30 mins of inactivity*

sup by Noiree February 26, 2010

sup 

What's Up?

Sup, my man?

sup by Christalyn October 18, 2003

SUP 

a way of acting ganstah

Hey

Sup?

SUP by PIGLET THE VAMPIRE April 12, 2011