A person with no sense that wobbles around town paying attention to no one but the voices in their head, a doobedoo is normally a slob/slothish person.
The fat guy staring at the light in the deep end of the pool is doobedoo.
To open the driver or passenger side of a vehicle while moving whith the intent to hit some unsuspecting pedestrian with it.
Pete: Hey ross, open your door and hit that bitch Cole Knowels with it.
Ross: Dumbass, you know my door dont open on the drivers side! I'll go around the block so you can hit him with your door.
Pete: Alright, I'll door that little fags' ass
A person who is on welfare or the dole, but is actually quite capable of finding work. He will often fake an injury or illness to substantiate his claim that he is unable to find a job or perform work if a job should be found for him. He finds it more convenient and easy to live on the dole.
What a doofer! He sits around all week watching Emmerdale, and only goes out once a week to collect his dole.