Beat the cream cheese in a large bowl with hand mixer until smooth. Add the mayonnaise, sour cream, 1 1/4 cups of the cheese, green onions, Worcestershire sauce, lemon juice, Old Bay seasoning, dry mustard, black pepper, and cayenne pepper. Mix well to combine. Add the crab meat and stir by hand just until combined.
8 ounces cream cheese, 1/2 cup mayonnaise, 1/2 cup sour cream, 1 1/2 cups shredded sharp cheddar cheese, 2 Tablespoons chopped green onion, 2 teaspoons Worcestershire sauce, 1 teaspoon lemon juice, 2-3 teaspoons Old Bay seasoning, 1/2 teaspoon ground dry mustard, 1/2 teaspoon freshly ground black pepper, 1/8 teaspoon cayenne pepper, 1 pound fresh lump crab meat