chain lightning

(Canada, US, uncountable)Lightning in angular, zigzag, or forked flashes.

smart as chain lightning (sharp-witted)

faster than a cat lapping chain lightning

a form of lightning that moves rapidly in a zigzag path with one end divided (fork-like)

(US, attributive, especially, uncountable)(A person or thing that is) very fast and dynamic.

Hettie was chain lightning with a six-shooter.

(US, obsolete, slang, uncountable)A high-proof whiskey or other spirit that has not been allowed to mature; a poor-quality or adulterated spirit.