The meaning is obvious. Using this word I got 4 hits in a Wordwizard search. But I have seen and heard it used quite often recently and I was wondering if it was a bone fide word, slang, or colloquial or what.<2017 “Some conservatives see upside-down [[Christmas]] trees as yet more proof of liberals’ politically correct war on Christian traditions. ‘It’s like the upside-down world . . . the bizarro world,’ . . .”—The Week, December 22/December 29>
My 2006 American Heritage Dictionary doesn’t list it nor does Random House Webster’s Unabridged Dictionary nor The Oxford English Dictionary. However, it is listed in the Merriam-Webster Unabridged Dictionary, Google Online Dictionary, Wiktionary, Oxford Dictionaries.com and some others. So, it has definitely arrived appearing in some dictionaries (the more nimble ones), indicating that it is a “relatively” new word. Merriam-Webster Unabridged Dictionary does not list it as slang.
adjective: Characterized by a bizarre, fantastic, or unconventional approach : outlandish, bizarre. <the director's bizarro vision> <a bizarro comedy>
noun: weirdo, misfit. <Showgirl breasts and round hips that swayed to a sultry beat when she walked and drew heartbreakers and bizarros from the four corners of the earth.>
Etymology: It is said that the earliest use was in the sense of "logical inverse", derived via the comic book character Bizarro, an inverted version of Superman from a planet where "good" means "bad" and so on and first appearing in 1958 with a ‘B’ on his chest instead of the Superman ‘S’. Whether this is the origin of today’s bizarro, which may have just been a tacking on of an ‘o’ on ‘bizarre’ without reference to the anti-Superman character is, I think, open to question. Weirdo tacks on and “o” to describe “a person with that characteristic.” In fact the use of ‘weirdo’ (circa 1955) predates the appearance of the anti-Superman character Bizarro by a few years, so perhaps the idea for the use of the ‘o’ in ‘bizarro’ came years later from its use in ‘weirdo.’ Wacko first appeared in the 1970s from ‘whacky.’ The first known use of ‘bizarro’ is from 1971.
(Merriam-Webster Unabridged Dictionary, Wiktiionary.com and Wikipedia)
The following are some quotes from archived sources (unfortunately the Oxford English Dictionary was mute on this one):
______________________________<1987 “She loves the Coens and their bizarro brand of moviemaking.”—Washington Post (D.C.),20 March>
<1990 “Brokaw and Pauley would no doubt be a more comfortable match than Reasoner and Walters - or the bizarro pairing of anchor aspirants Sam Donaldson and Diane Sawyer on ‘PrimeTime Live.’—Chicago Sun-Times (Chicago, Illinois), 27 May>
<1996 “And let us not forget the bizarro turns of ‘Seinfeld’ and ‘Roseanne'' - ‘Seinfeld' in a weird new head space, and Roseanne with a lottery win and a weird new face.”—Knight Ridder/Tribune News Service, 27 December>
<2005 “The harp is a little bizarro, I know, but I figured `Why not?' since all the other girls would probably be playing keyboards.”—The Boston Globe (Boston, Massachusetts), 10 February>
<2011 “. . . we've entered ‘bizarro world’ in the discussions over extension of the payroll tax cut.”—States News Service, 22 December>
<2018 “. . . and of course, at the center of everything was our brand-new president, whose bizarro fusion of pop culture and politics make the days of The Governator seem quaint.”—Deseret News (Salt Lake City, Utah), 2 January>
Ken Greenwald – January 15, 2018