Despite having the word 'banter' in its name, someone described as a Bantersauross have no banter whatsoever. In fact, they are usually the brunt of the jokes.
Moose was both horrified and amused as he fell backwards into arms of his fellow team builders unable to control the powerful release of a fluttering bandersnap.
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.
A portmanteau of "banker" and "gangster", popularized by (among others) the economist Murray N. Rothbard, used by him to attack what he held to be the inherently fraudulent nature of Fractional-Reserve banking (as opposed to 100% gold reserve banking, which he defended as the only honest form of banking). Frequently used in reference to The Fed.
In more recent popular usage, often refers in a vague way to the forces of "Wall Street", or to those persons in the financial services industry who grow rich despite the continued impoverishment of those who depend on their services, and despite their apparent inability to succeed in business without constant government assistance.
"The Fed is an organized cartel of banksters, who are creating inflation, ripping off the public, destroying the savings of the average American."
"The banksters crashed the economy, but thanks to generous federal bailouts, they won't have to sacrifice their fat bonuses."