The story
Borrowed from Japanese パチンコ (pachinko), from ぱちん (pachin, onomatopoeic sound of the machines) + こ (ko, diminutive). Compare etymology of gacha, from Japanese ガシャポン.
Etymology from Wiktionary, CC BY-SA 4.0.
pachinko
pa·chin·koToday it means: A mechanical ball-dropping game similar to pinball, popular in Japan. Full definition →