What does the slang term - you go changing mean?

The slang term "you go changing" is actually a misunderstanding or mishearing of the phrase "you go chasing".

"You go chasing" is an informal way of saying:

* "You're going after someone or something"

* "You're pursuing someone or something"

* "You're trying to get someone or something"

For example:

* "You go chasing after that promotion, you might just get it."

* "Why are you always chasing after the latest fashion trends?"

"You go changing" doesn't have any real meaning on its own. It's likely just a mistake, and the person meant to say "you go chasing".