Hmm.. the "D what" thing went over my head. Inside joke?
I was suckered into asking "D what?" which in a circle of juvenile males would be followed up quickly with "DEEEZ NUTS!!!!". In the classroom it was just followed by laughter.
This came shortly after I was asked who I carpooled to work with and when I mentioned that I carpool with the hottie bio. prof. all the guys were "mmmmmhhhmmmm, I'd be takin' the long way through th backroads if I were drivin' with her!!" It was a bad day all around...