Grasshopper Sarcasm
When in conversation, person A says something that person B knows is sarcastic but cannot detect the sarcasm in person A's voice. Derives from when a grasshopper is in the grass and you know it is there but you cannot see it.
After Steve has had a mild day of work/school mainly consisting of fooling around.
Steve: "Today was really tiring, I had loads to do"
Alan: "Really? Or is that just grasshopper sarcasm?"
Steve: "Today was really tiring, I had loads to do"
Alan: "Really? Or is that just grasshopper sarcasm?"