a conversation where what you re saying really means the opposite or you're really just not being serious the whole time and then usually goes back to a normal conversation
"I hate you"
"good you make me sick anyway now get out of my face."
"so are we getting together on monday for the game still?"
"yeah I think so"
The fake conversation is the first part where the first person just said I hate you to start talking to the other person and get their attention.