Some one who is one donut short of a dozen is basically missing a key element to their brains. A.K.A., they are stupid.
One egg short of a dozen works too, but that sounds nasty.
P1: Look at Anna- ew, why is she hugging that cardboard cutout?
P2: Oh, she's one donut short of a dozen. She thinks that's her boyfriend.
12👍 4👎