Katy Perry describes in "CRUSH" the feeling of being in love and having a crush that evokes strong emotions in her.
The text shows how she feels in a sweet daydream, marked by butterflies in the stomach and indescribable feelings.
She describes the physical reactions of her body to the presence of her crush, like palpitations and a new flutter, and the need for medication to deal with these intense feelings.
The song's chorus revolves around the uncertainty and excitement of being in love, illustrated by the question about a crush.
Katy Perry expresses the joy and thrill associated with intense feelings, and asks for an explanation for her strong sensations.