chatvite poof
The instantaneous log off used to dodge a chat invite or IM.
"Hey, what's up? I just wanted to say hi online last night but you gave me the chatvite poof."

"I hate that guy, he always wants to chat. I just give him the chatvite poof. "

Someone more naive might say, "Gee, Ed must have a really bad internet provider; he keeps losing his connection".