Heat a large skillet over medium-high heat. Cook and stir beef, onion, and garlic in the hot skillet until browned and crumbly, 5 to 7 minutes; drain and discard grease. Transfer beef mixture to a slow cooker.
Stir pinto beans, tomatoes, tomato sauce, and tomato soup into beef mixture.
Mix chili powder, sugar, Italian seasoning, garlic salt, and pepper together in a bowl; stir into beef mixture. Add beer.