Wassup means whats up. Whats up is a way of asking how some one is, and or what someone is doing.
Se Wassssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssup.
Most people with an IM start a
conversation by saying Wassup, or its shortining sup. Sup can
mean the same thing, or a random thing. Only in America