twock

noun

1. The sharp, quick sound of one hard thing hitting another hard (or rubber or leather) thing, especially sports equipment such as a bat hitting a ball.“Hordes of shadow people, adult and child, milled from one end of this yellowing old room to the other, stopping to hunch over assorted fantasy devices. The noise was stunning, a garble of mechanical exclamation, the twock twock of the air hockey games […]”
2. A twang; the sharp, quick sound an arrow being shot (and a bowstring vibrating) or hitting something hard.“[…] he offered Olivia the bow. […] Twock! “Dead center!” “What skill,” cried Cara, with a clap of her hands. “What luck,” riposted her cousin. What fun. Olivia stilled the quivering bowstring with her thumb but it was not quite so easy to control the twitch of her lips. […]”