A suffix added to the end of a name of someone who is pompous, pretentious, and otherwise grossly beguiled by their own sense of entitlement, and their given name doesn’t justify their personality enough.
Lauren: I want to talk to your manager, I demand my 72 cents.
Ben: Chill out, it’s not a big deal. You’re being a real Lauren Amadeus Bandersnatch Weissenhaus right now.
One among many archaic nonsense words used in the classic poem "The Jabberwocky" by Lewis Carroll. Could possibly be a monster more horrible than the Jubjub bird.
"Beware the Jabberwock, my son!
The jaws that bite, the claws that catch!
Beware the Jubjub bird, and shun
The frumious Bandersnatch!"