"He's a couple sandwiches short of a picnic"

In this quote, Lance Bass is using a common phrase to describe somebody who may not be the sharpest or most intelligent individual. The expression "a couple sandwiches short of a picnic" is often used to imply that someone is missing out on a couple of key elements or pieces of information, comparable to how a picnic would not be total without sandwiches. It can likewise recommend that the individual is a bit odd or eccentric. Overall, Bass is utilizing this funny expression to communicate that the individual in concern might not be the brightest or most typical individual.