The phrase "two bricks short of a load" is a colloquialism used to describe an individual who might not be the sharpest tool in the shed. This expression can seem quite harsh, and there are many other euphemisms that can be used in its place. Some of the synonyms for "two bricks short of a load" or mental ability that is limited include "not the brightest bulb in the box," "a few fries short of a happy meal," "not playing with a full deck," or "one sandwich shy of a picnic." Using these expressions can be a gentler way of criticizing someone's intellect or the ability to grasp something fully.