Oppositional defiant disorder is a psychiatric category listed in the Diagnostic and Statistical Manual of Mental Disorders where it is described as an ongoing pattern of disobedient, hostile, and defiant behavior toward authority figures that goes beyond the bounds of normal childhood behavior.
To meet DSM-IV-TR criteria, certain factors must be taken into account. First, the defiance must interfere with the child’s ability to function in school, home, or the community. Second, the defiance cannot be the result of another disorder, such as depression, anxiety, or the more serious Conduct Disorder. Third, the child’s problem behaviors have been happening for at least six months. The diagnostic criteria for this disorder are as follows:
Losing temper
Arguing with adults
Refusing to follow the rules
Deliberately annoying people
Blaming others for own mistakes
Easily annoyed
Angry and resentful
Spiteful or even revengeful
If the child meets at least four of these criteria, and they are interfering with the child’s ability to function, then he or she technically meets the definition of Oppositionally defiant

Info Source, Links and more info:
http://en.wikipedia.org/wiki/Opposit...fiant_disorder