This quote humorously compares the state of the speaker's brain before and after making out with Fang. It suggests that their brain is feeling overwhelmed or affected in some way, as indicated by the phrase "It's very sad."
The quote is taken from a book by James Patterson, showcasing a playful and possibly humorous perspective on how certain experiences can influence one's mental state. The character named Max seems to be expressing her feelings in a relatable and light-hearted manner.