Green’s Dictionary of Slang

a strange, eccentric person; a transvestite.

1980		(con. 1965) W. Sherman Times Square 13: Joe thought about arresting the bizarro, but he knew the case would be thrown out.
1986		C. Hiaasen Tourist Season (1987) 289: If you threw them all together you’d have the scariest nest of bizarros in the history of the planet Earth.
1989		C. Hiaasen Skin Tight 175: Stranahan had seen some bizarros in his day, but this one took the cake.