Definitions by Jmb529

In like flint 

When flint was discovered to be excellent for starting fires, it became universal. So when something is way popular, it's 'In like flint'; the 'In' thing. In the 60's people would say, "It's in, man. "

Man, those Bic lighters are in like flint.

In like flint by Jmb529 May 17, 2022