The cinematic conceit of blowing shit up on a large scale, in slow
motion and (usually) at sunset.
A portmanteau word employing the concept of the inevitable incendiary mayhem employed by uberhack Michael
Bay in lieu of characters, a script or a a pube's-weight of
reality.
A:
Dude! Did you
dig the plot in Transformers?
B: Hell, no! I was only there to watch the Bayhem!
or
A: I can't believe The Knight lays waste to Los Angeles at the end of Bruckheimer's remake of "The Seventh Seal."
B: Yeah, who needs Kierkegaardian themes on
death and meaning when you can unleash total Bayhem?