"Drill baby drill" is a phrase that some people use when they want to encourage others to look for and extract oil and gas from deep underground. Oil and gas are sometimes called "fossil fuels" because they were formed millions of years ago from the remains of plants and animals that were buried under layers of sand and mud. These fuels are important because they can be burned to produce energy that people use to light their homes, run their cars, and power their factories.
So, people who say "drill baby drill" are basically saying that we should find and take out more oil and gas from the ground. They want to do this because they believe it will help us to have more energy and to be less dependent on other countries for fuel. However, there are also people who disagree with this idea. They worry that drilling can be dangerous to the environment, and can hurt animals and plants that live in the areas where drilling is happening. So, while drilling for oil and gas can be important, there are also important concerns that need to be considered when deciding whether to do it or not.