A full-deckism is a term used to describe somebody who isn't all there. It is derived from the phrase not playing with a full deck.
- Not the sharpest sword in the armoury
- He has a few fighters missing in the shield wall
- He's a few points short of a coronet
- A few kicks short of a galliard
- Off to invade Russia again
- In the front line of the French charge at Agincourt
- Nutbar with extra almonds
- An exhaustive list of full-deckisms.