I've certainly heard of them and have visited a couple in my travels.
Buc-ee's is an American chain of country stores, gas stations, and electric vehicle chargers created and owned by Arch "Beaver" Aplin III, headquartered in Lake Jackson, Texas. The chain was first founded in 1982 in Clute, Texas and began expansion with its first travel center in Luling, Texas in 2003. The company began expanding outside of Texas in 2018 with the opening of a location in Baldwin County, Alabama, and has since opened locations in Georgia, Florida, Kentucky, South Carolina, and Tennessee, with new locations planned for other areas, including Colorado, Missouri, Virginia, and Wisconsin, if they're not already there.
The chain is well known for the large size of its locations, alongside its product offerings of fuel, snacks, brisket, baked goods and commodities, tacos, fresh sandwiches, souvenirs, and travel items. The chain has also become well known for the cleanliness of its bathrooms, its mascot, and the company's prohibition of 18-wheelers at their locations.