I hear people say 'Let's go grammar' and the title of this book is 'Go grammar' What does 'go grammar' mean?

Omar AhmedI hear people say 'Let's go grammar'

I don't.

Omar AhmedWhat does 'go grammar' mean?

It means you should use a different grammar book. Future Kids Publishing's website informs us that "the reader enjoys sinking into the depth of information and knowledge" "beyond an enriched source of wisdom". It was evidently written by non-native speakers for people who can't tell the difference. The phrase "go grammar" is broken English, an attempt to sound edgy.