The phrase "gang busters" means doing something with great enthusiasm, energy, or force, often to tackle a difficult or dangerous situation. Full definition
Just like the rest of the house this fall, I decided to sit back and let nature take over outside instead of going gang busters with indoor fall decor. (dukemanorfarm.com)
That car priced at $ 30,500 - 31,000 would sell like gang busters. (cheersandgears.com)
What's most concerning about all of this is the fact that the movie has already done gang busters in China. (kotaku.com)