1. using every resource/effort/force available, best possible performance
go out with all guns blazing
To do something or approach something 'with all guns blazing' is to approach it with energy and force: "We need to go into this meeting with all guns blazing. We can't concede anything." This is an idiomatic expression used in social and professional situations. 'Crazy as hell' and 'mad as a bear' are similar expressions.