Judy Hopps and Nick find a notebook while investigating The Mystic Spring Oasis. Judy points out that the notebook's cover has the name "Flower" written all over it; therefore it must belong to Flower. But Nick suggests that the person who scribbled the names might be a boy who likes Flower.
Nick then explains that he did this same thing in school when he liked "this girl named "Marian". He adds that she was not happy when she discovered her notebook covered in scribbles.
It's possible that Marian is a reference to Maid Marian, a vixen, from Disney's Robin Hood.