gangbusters
Gangbusters (adj) means Extremely successful or thriving. Example: “Sales have been going gangbusters since the product launch.”
How to use gangbusters
Learner’s notesIn plain EnglishDoing extremely well, often used for business or performance results.
Informal, mostly American English.
Fill the gap
Can you complete this real example?
Sales have been going _____ since the product launch.
Etymology
Shortened from the phrase "like gangbusters," originally referring to police busting up crime gangs with dramatic force.