Wiktionary
go wild
vb. (context idiomatic in the imperative English) Go ahead; do as you please (non-gloss definition: used to grant permission for or to give endorsement of a suggestion or proposal, especially when the speaker is not interested in the outcome of the proposal).
Usage examples of "go wild".
After all, she did go wild under the influence of dwa, and she did make an attempt on the life of an Elf she believed to be Gulas.
Then like as not they hook up with one'a the dog packs an' go wild an' start runnin' stock.
Although there is always a chance for magic to go wild or simply to create or exhibit something its wielders did not intend or anticipate, there has always also been a place in the Art for deliberate randomness.