1- A person who is lacking in or completely devoid of intelligence.
2- A person with an IQ less than that of a shovel and two candy bracelets.
-Hey did you hear about that guy who robbed a drug store and left behind his ID? -Yeah that guy is such a dumbadose!
1. An individual who is completly and utterly devoid of any style or sense.
2. Anyone whose I.Q. is less than .000000000009, or less than that of a tin can and a table leg.
Chuck: "You hear about that guy who robbed the bank?" Phil "Yeah, he was such a dorkenheimer, he tried to hitchhike with an unmarked police car!"