yo’是什么意思？

yo' = you

good ol' boys = good old boys (老好人)

good ol' day = good old day (美好时光)

I'm lovin' it. = I'm loving it.

'cause = because

这是美国英语，意思是“used to greet someone ,to get their attention ,or as a reply when someone says your name.”其实就是引起某人的注意用的。
还有什么缩写，尽管说罢

you 的意思。例如, hey yo! didn't hear what i said? 喂！你！没听见我说什么吗？！
ain't 意思：not. 例如，I ain't got nothing. 我什么也没有。 I ain't coming. 我不去。

ain't :貌似是am not, are not, is not, have not等缩写。