In a 3-1/2- or 4-quart slow cooker combine the cheese food spread, undrained tomatoes, chipotle peppers in adobo sauce, and Worcestershire sauce.
Cover and cook on low-heat setting for 3 to 3-1/2 hours or on high-heat setting for 1-1/2 to 1-3/4 hours. Whisk before serving. Serve warm with vegetable dippers. Keep warm on low-heat setting for up to an hour. Makes 4-1/2 cups dip.