stone skipping, stone skimming, stone skiffing, playing ducks and drakes (act of throwing flat stones to the surface of water and trying to make them bounce)
köken: leipien (“of breads”) + heitto (“throw”) - the resulting circles on the surface of the water look a bit like a row of round breads; a similar idiom is used in Swedish and in Russian (throwing blinis), but it's unclear whether they have a common origin. Note also John Higgins' definition from 1585: A kind of sport or play with an oister shell or stone throwne into the water, and making circles yer…