Top Definition
A person who uses an instant messaging client, but all they ever say is "hey, what's up?" or "sup" or something similar. They also never try to have an actual conversation.
"Mike is such a heywhatsupper, I don't think we've ever had a real conversation"
by Very bored person April 07, 2008
1 more definition
Someone who uses an instant messaging client, but all they ever say is "hey, what's up?" or something similar. They will also never try to have an actual conversation.
"Joe is such a heywhatsupper, we've never had a real conversation, and it's really getting annoying."
by Very bored person April 08, 2008

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