A rally of like minded morons. Usually reserved for a group of people who gather together to psyche themselves up before a pointless/meaningless/worthless event.
The (insert any group) convention really turned into a prep-rally.
by Bubba Backwater October 15, 2006
pre-sporting event school assembly given to support the sports team that only the preps want o go to
That prep-rally this afternoon went on forever.
by Sunflower January 23, 2005