This charming song is a real oldie:
https://www.youtube.com/watch?v=J68LSs565_A
It includes the following line:
忆童年时竹马青梅
I understand 竹马青梅 to be a reference to childhood things (竹马 would be playing horses with a piece of bamboo), and the singer is saying that she remembers her childhood.
I feel that 青梅 must also have a special meaning here connected to childhood. Literally it is just "green plums". Perhaps it's referring to orchards where children might play together?
What does 青梅 mean in this context?
Complete lyrics are below.
时光一逝永不回
往事只能回味
忆童年时竹马青梅
两小无猜日夜相随
春风又吹红了花蕊
你已经也添了新岁
你就要变心像时光难倒回
我只有在梦里相依偎