Of an object To make a noise like something moving quickly through the air.
The holder of the torch grunted, and (after pausing a second at B.'s bed to inspect a picture of perfect innocence) banged out through the door which whanged to behind him...1922, E. E. Cummings, The Enormous room:
I don't know how long it might have gone on if Grandfather hadn't lost his temper. He swung the bridle up over his head and whanged it down across the buckskin's rump.1993, Ralph Moody, Edward Shenton (illustrator), The Fields of Home, page 31
"[…] My God, Joolby, I even sang 'Dreaming of Thee' at a saturnalia called a 'Penny Reading' there, simply because the young lady who whanged the piano had a job of feeding a machine in the drying-room."1934, Ernest Bramah, The Bravo of London:
4
Scotland To slice, especially into large pieces; to chop.
"Now I suppose you never take any particular notice of cats, 'Orace?" "Can't say as I do. Except now and then to have a whang at one."1934, Ernest Bramah, The Bravo of London: