k'chunk

Next you'd see a raft sliding by, away off yonder, and maybe a galoot on it chopping, because they're most always doing it on a raft; you'd see the axe flash and come down -- you don't hear nothing; you see that axe go up again, and by the time it's above the man's head then you hear the k'chunk!

Adventures of Huckleberry Finn 1884