Well, sup is anther way of saying hi so just like when you say to someone and they say hi back people say sup back to you.
If someone says sup in chat then the reply is usually nuttin. Sup is short for whats up
not much, homie G
Reply what are you doing now or a simple "sup"
when happy say sup
Bye, sup, and hi are all greetings. 'Sup', and 'hi' being ones that you would say when meeting someone, and 'bye' being a greeting you'd use when you're leaving or hanging the phone up.
In Chinese, you can say "你好吗?" (Nǐ hǎo ma?) or simply "你好" (Nǐ hǎo) to greet someone informally, similar to "hey sup" in English.
sup - 燮 (Xiè) (That's Simplified Chinese.)
He's asking you how you are. There's not much else you can read into "sup".
When someone says congratulations to you, or when someone congratulates you, say, "Thank you".
if someone says your funny just say lol i know. lol get you out of everything.
The same thing you say when someone says "you're welcome" - nothing.