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I'm actually flabbergasted by the number of people who on here who don't know this reference.

What the hell is a gigawatt?

A watt is a measure of power. It measures the power at that instant of time.

A watt-hour is a measure of energy. It measures the power used over time.

Giga is an SI prefix. 1 gigawatt is 1*10^9 watts.

It's normal to measure the output of power plants in megawatts or gigawatts.

Great Scott, it's a Back to the Future reference, not a serious question.

Jokes are generally frowned upon here, and are often asked to be kept on Twitter or Reddit. This keeps the comment quality high here.

10^9 watts? a watt is a unit of power

Why?

Sorry. It is a Back To The Future movie reference. The time travel machine uses exactly 1.21 Gigawatt.