Cook onion in butter until tender. Stir in flour, mustard, Worcestershire sauce, salt, chili sauce, parsley, and hot pepper sauce. Add milk; cook over low heat, stirring constantly until thickened. Stir a small amount of hot mixture into beaten eggs, then return egg mixture to pan. Cook, stirring several minutes. Add crabmeat. Stir gently until crab meat is warm. Serve warm with assorted crackers and/or chips.