lacking reason or common sense; very foolish or irrational

if Luke wasn't here I'd go crackers

a person or thing that cracks

a decorated paper cylinder which, when pulled apart, makes a sharp noise and releases a small toy or other novelty

a Christmas cracker

a thin dry biscuit, typically eaten with cheese

the sausage is delicious on hot toast or crackers

a fine example of something

don't miss this cracker of an album

a contemptuous term for a white person, especially an impoverished white person living in the southern US