Definitions

1. noun

a person or thing that is unusually good or impressive of its kind

“The fireworks display was a real humdinger, lighting up the entire sky.”

2. noun

something that is exciting or thrilling

“The new rollercoaster ride was a humdinger, with steep drops and sharp turns.”

3. adjective

exceptional or impressive

“The humdinger of a performance by the rock band left the crowd cheering.”