If you say that something will happen as sure as eggs is eggs or sure as eggs, you mean it will certainly happen. He'll be back, asking for more money. Sure as eggs is eggs. If you don't deal with the problem now, then sure as eggs you'll have cause to regret it later. Note: This expression may be a variation or mishearing of `as sure as x is x', referring to the use of x to represent a variable in algebra and logic.