Cooking With Gas Edit Meaning

1.

Efficiently performing a task after a long period of inefficient performance or possibly failed attempts at the entire task or certain steps in the process.

(After thirty minutes of working hard and getting almost nothing done but then suddenly finding a way to do it efficiently)

NOW we're cooking with gas!

See working, time, speed, fast

2.

(variants: oil may replace gas)

working very efficiently(an elaboration of cooking)

Once I am donerading the book I have chosen to write about, I will be cooking with gas.