carby adjective 1noun 1forms 3 adjective1 •(informal) Rich in carbohydrates.We'd better lay off the carby foods. It'll help protect our vascular health. noun1 •(Commonwealth, informal) Synonym of carb (“carburetor or carburettor”).We replaced the old carby with an aftermarket throttle-body fuel injection unit. formscarbies · more carby · most carby