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The term "George" for a big tipper comes, simply, from the George whose mug fronts the one-dollar bill: A big tipper hands out so many dollar bills that he might as well be Washington himself. There are also levels of Georges. An inordinately big tipper has always been "big George," or sometimes "super George," "monster George," or "king George." The biggest of the big? That’s "KING KONG George." Famous examples of Georges include deceased Aussie media tycoon Kerry Packer, Ben Affleck, Frank Sinatra, Richard Pryor, and Elvis.
The (printable) opposite of a George is a "stiff." ("Stiff" is also a verb, as is when you stiff a waitperson after eating.) Celebrities known to fall into this category include Pete Rose, Bill Cosby, O.J. Simpson, Bruce Willis, and Bill Gates.
Hence, the name of David McKee's blog on this site, "Stiffs and Georges."