He's asking you how you are. There's not much else you can read into "sup".
I believe he is using a common contraction. 'Sup? instead of "What's up"?
It Means Whats up.
If someone says sup in chat then the reply is usually nuttin. Sup is short for whats up
Assuming you mean sup as in "what's up?", it's spelled 'sup.
sup means whats up
Sup means to dine with or eat with, as in supper
The universal answer for everything (says my boyfriend)
he is single.
it means how are you
not much, homie G
you say what up
"Cal sup re" means nothing in French.
that he likes you