Flambunctiousness is the act of entering a social gathering in an over the top, excitable manner. Your aim is for people to notice you so that your / their approach will be made easier later on in the evening. Very popular among the gay community as a manner of greeting.
Being both flamboyant and rambunctious usually in a very gay way. Like a chaotic good or chaotic neutral alignment. Think Freddie Mercury or Crowley (Good Omens)
The act of doing totally idiotic things when you are drunk, e.g. punching holes in the wall, throwing beer bottles at cars on the freeway, or grinding on the lead guitarist. Being "slammed" and "rambunctious" at the same time.
Ralph: Damn, did Diesel flip over the pool table again after the band left?