It's like saying yes, only not. Mostly used when you agree with something, but could go the other way if you felt like it.
"I want you to add another buff to the healing NPC."
"...Indeed..."
-
"You're not going out there, are you?"
"Indeed!"
"...Indeed..."
-
"You're not going out there, are you?"
"Indeed!"
by Kyithios February 23, 2009