Piro speaks:
Like any english language class, there are some students that can speak english better than others. It is not the entire class that is responding (some can barely follow what is going on). Also, there is humor in a student saying "disturbingly accurate"... it IS an english class, after all, you know.

sensei = teacher
l33t skillz = leet skills
m4d skillz = mad skills
The practice of high school girls getting money from older men is known as enjo kosai.