Ivan Kreilkamp at The Millions:
What does “in a weird way” mean, and why did it become so much more prevalent in the late-20th century? The first uses of “weird” in English refer to “weird sisters,” as made famous by Macbeth (though the usage precedes the play), and in its earliest 19-century citations, “in a weird way” invariably means in an uncanny, creepy, or supernatural way. Some of the things that most often occur “in a weird way:” trees or leaves rustling in the wind, fires blazing up, and people muttering, singing, or murmuring. From an 1888 collection of sermons, describing the prophet David: “The demon was cast out, and the dark powers of the creation were mightily stirred up by it, and David, on his way home that night, felt them all about him in a weird way.” From an 1897 article in The American Archaeologist called “Notes on Delaware Indian Village Sites:” “The stone cists once occupying the eastern side of the burial place have been destroyed by the plow; the white oaks whose leaves rustled in the fall winds in a weird way have been cut down by the avaricious lumber man.” From “Catching the Wild Horse in South America,” in the Report of the Rugby School Natural History Society for the Year 1879: “A couple of the fattest mares captured are slaughtered, and without troubling themselves to skin them, the men cut up the carcases in huge joints, ribs, loins, back, etc., and pile them on the fires, which blaze high up in a weird way, owing to the quantities of fat and grease burning.” From the Wide World Magazine of 1898: “the native divers had tumbled out of their boats, and were swimming in a weird way down to the bottom of the translucent sea.” From a 1910 female traveler’s Journal of Japan: “I saw a most interesting method of laying a foundation of a native building — two dozen women pulling on a fan of ropes, and singing in a weird way, half drawing and twisting between each pull.”
more here.