All sorts of yayness floods my brain. Love is such a drug.

The line uses deliberately goofy, adolescent diction (“yayness”) to capture the sudden, involuntary rush of infatuation—an emotional high that feels less like a choice than a chemical event. Calling love “such a drug” frames romance as intoxicating and potentially destabilizing: it can flood perception, override judgment, and create cravings for more contact or reassurance. The phrasing also hints at self-awareness; the speaker recognizes the experience as a kind of altered state even while enjoying it. In John Green’s typical register, the humor softens the intensity, suggesting that earnest feeling and irony can coexist in the same moment.