A person as dumb as a sack of potatoes.

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

1. A potato

2. A boy who has not hit puberty.

3. A follower of the new wave band Devo. Used almost exclusively among fans

A hole in a sock. This is due to the appearance of the foot through that hole being likened to that of a potato. Most noticeable with heavy contrasts of skin colour to sock colour. This may well be a south of Britain colloquial term, but this hasn't been firmly established.

A particularly inneffective person, thing or action. Usually in the sporting arena but can be used for a variety of professions.

Affectionate term for a baby or small child. The history of this phrase is lost in the mists of time but possibly stems from the slang term for potato. Two children may be referred to as Spud and Spud junior.