Partial calque from Early Mandarin 玉蜀黍 (yùshǔshǔ), from 옥(玉) (wok, “jade”) + 슈슈 (sywusywu, “sorghum”, from Mandarin 蜀黍 (shǔshǔ)).
옥슈슈 (woksywusywu)