cooking with gas

gas and air

An equal mixture of nitrous oxide and oxygen, used as a mild analgesic and anaesthetic, particularly during childbirth, for dental procedures, and in emergency medicine.

have a gas

Have a good time.

hit the gas

To go; go faster.

now you're cooking

Used to praise someone for adopting a more effective or suitable method or approach, or to signal that progress is being made.

what's cooking

A greeting, similar to how are you?; what's happening?; what's up?; what's new?