蓝颜蓝着蓝着就绿了
[lán yán lán zhe lán zhe jiù lǜ le]
A playful phrase using color symbolism. Blue often represents calm or sadness in Chinese culture while green can imply growing or envy. The phrase could humorously signify a close male friend ('blue' representing platonic) evolving into something envious, perhaps a hint of unreturned feelings turning sour or even a joke on a friend becoming increasingly jealous.