西瓜的爱人是夏天夏天的情人是西瓜
[xī guā de ài rén shì xià tiān xià tiān de qíng rén shì xī guā]
The meaning here is romantic in a playful way. It humorously says 'watermelon's lover is summer, and summer's sweetheart is watermelon,' highlighting the close connection between watermelons and hot summer days.