ODD is, in my opinion, one of those diagnoses that is the result of the excessive "cataloging or delineation" by the AMA. Other professional clinicians I've spoken with about ODD tend to refer to it as a diagnosis "du jour," an allusion to its current popularity, so to speak. Regardless, it has been accorded 313.81 in the DSM-IV. Those with ODD have, to coin a phrase, a bad attitude. That is to say that they are negativistic, argumentative, hostile and defiant (the operative word). Further they tend to be moody and irresponsible (blame others for their predicament) and apparently deliberate in their actions toward others, especially authority figures.   
A well-rounded presentation on ODD by Jim Chandler, M.D., FRCPC. can be found at: http://www.klis.com/chandler/pamphlet/oddcd/oddcdpamphlet.htm.   
It seems to me that an "ODD attitude" is to be expected as part and parcel of any neuro-biological impulse disorder. Considering what the afflicted suffer with, it's no wonder they exhibit a less than desirable bright and cheerful demeanor. Given, again, the high co-morbid occurrences, especially with regard to mood, I actually expect to be confronted with the ODD mind-set. To me, it goes with the impulse disorder turf.  

Tourette Syndrome
Attention Deficit Hyperactivity Disorder
Obsessive Compulsive Disorder
Intermittent Explosive Disorder
Bi-Polar Disorder
Generalized Anxiety Disorder

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