Adjective, noun; to be belligerent and arrogant, to willfully disregard quality advice and pursue delusions of grandeur of achieving a victory in the US Supreme Court striking down all marijuana law on the basis of arguments that have failed countless times for others. A finshaggy naively believes that the courts and the police are honest, and that waving a copy of the Constitution before a cop is like warding off a vampire with garlic.
This finshaggy dude went to jail for a year after his appeal was laughed out of court.
