I don't #
It's like when you're being yelled at by a teacher and you still don't know what's going on. You're just like, 'I don't #.' You're the class clown of confusion.
"She asked me a question. I said, 'I don't #.'""
"He was explaining math. I said, 'I don't #.'""
"The teacher asked me to do a problem. I said, 'I don't #.'"