too much information

Yesterday my driving student got in the car and started to squirm around (This kid kinda physically resembled Ralph Wiggum from The Simpsons and talked like a nerdy robot) I looked over at him and said, hey man the lesson is 2 hours long, so if you need to stop and use the restroom, let me know.

He said "that will not be necessary, i just did both before you picked me up." "I will not urinate in the next 2 hours and i will not need to defecate for at least 4 to 6 hours."

I said "TMI"

He said" TMI?"

I said "Too much information"

He laughed real hard as if he never heard it before and said "TMI, too much information, hilarious, i will have to use that one"