I am on a roll day.

reportedly: 보도에 따르면, 전해진 바에 따르면

book report ==> 독후감, 

report card ==> 성적표

What are so giddy about?

(giddy = 들떠있는, excited)

I am on a roll day. ==> 오늘 뭔가 잘 풀리는 날이네.

roll up your sleeves, roll up/down the window.

That's definitely rare for you.

(너한테 그럴 일이 별로 없을 건데...)

be finished with => 

Call me when you are finished with meeting. 

I am not finished with the book yet.

I'll pass on that.

(사양하다, 영화 출연 같은 것을 고사하다.)

So ~ : 이야기를 시작하면서 사용할 수 있다. 그러니까..

What was going through my mind?

(도대체 무슨 생각을 했던 거지?)