carb up(shortening of "carbohydrate": to eat large quantities of carbohydrates before a major physical exertion in order to store up energy (usually followed by up):: Some marathon runners carb up on spaghetti the night before a race.'More)
carb(shortening of "carbohydrate": to eat large quantities of carbohydrates before a major physical exertion in order to store up energy (usually followed by up): Some marathon runners carb up on spaghetti the night before a race. 'More)