Dumb-ass

Someone who has completely missed the point or meaning of something. Someone who has made a big mistake with a simple concept. A combination of dumb (stupid, mentally challenged, unaware) and ass (denoting someone or something living).

A person who while driving a motor vehicle stops on a green light and goes on a red. Dumbass.
A burgular who breaks into a fish 'n chip shop and after cooking a feed, falls asleep to be awoken by the police and thrown in jail. Dumbass.
A person (or animal) who can be described as not knowing one end from the other.

Dumb-ass definition=Urban Dictionary's definition of sheila. Sheila means female. There is also no such thing as a sheila nigga. Nigga is a slang word used only with close mates of similar color but is used discretely incase of getting the beats, manhandled, pummeled, or just plain physically abused. For that Uban dictionary's definition is a dumb-ass definition. Almost all definitions related to sheila is wrong. The person who wrote it is a dumbass.