faster than greased lightning

1. adjective Incredibly quick or speedy. Did you see that martial arts expert? Those kicks were faster than greased lightning! The microprocessor at the heart of the supercomputer is faster than greased lightning. I hear that roller coaster is faster than greased lightning, so I really don't think you're going to like it.

2. adverb Incredibly quickly or speedily; as fast as possible. Mary raced out of the room faster than greased lightning when she heard the teacher coming. You'd better get to the store early if you want to find a good deal. Everything usually sells out faster than greased lightning. Good luck beating Chris in the race—that dude runs faster than greased lightning.