Dinlow, or dinlo, is the Romany word for an idiot or fool. It has also been incorporated in the rural dialects of some farming communities, such as Portsmouth in Hampshire, where there is a large gypsy population.

someone who is sexy beyond mean

Stupid,or insane.Entering common usage via traveller or gypsy language.

Portsmouth slang for someone who is, or does something stupid.

Word used to describe an idiotic person - in the situation where a person has done something idiotic they can be referred to as a dinlow. A person can also be identified as a dinlow for being known to do idiotic things on a regular basis. Similar to twat.

Portsmouth (England) word for idiot

A word used to describe someone with low intelligence.
Also used as an insult when someone has said something stupid.
(First heard at secondary school in the 90's in Gloucestershire.)
It has many variations in spelling...