go and do something

go and (do something)

To be so foolish, negligent, unfortunate, or thoughtless as to do something. "Go and" in this sense is used as a modifier to express or intensify a negative sentiment regarding the action. You can have a few cookies as a snack, but don't go and spoil your appetite for dinner! I had the money in my pocket to cover rent for this month, but I went and spent it all at the bar.
See also: and

go and do something

(informal) used for expressing anger that somebody has done something: Why did you have to go and tell him? It was a secret.Look what you’ve gone and done now! That was my favourite vase.
See also: and, something