A moron that says "The Sky Is Up" when you ask What's up

It's a shorter way to write wassup/whatsupp.

Sup is a word like hi or hello mostly referring to a greeting

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.

When you sit down to eat at a restaurant and dash before paying.

little fat gay ginger kid wlkes up to his lesbian grandma and says sup biatch and she replais with aaaaaaaaaaaaaaaaaa

1) Term used to say "HI" to your friends
2) Big means "Big Guy" also as "buddy" or "mate"

Term used in Canada