"What?" He had really only been giving her half of his attention, the rest was focused on not tripping, dropping her books, or giggling uncontrollably. He felt completely and utterly out of his depth. "Oh, uh, y-yeah. F-fine. Class. I mean. I-its was f-fine."
Good going. Now she knows that you're not just a stuttering idiot, you're a stupid stuttering idiot. Why not go for the gold? You could throw up on her shoes, I bet she'd like that!