also: でんすけスイカ
noun
Densuke watermelon; black-skinned watermelon variety
A premium Japanese watermelon cultivar with a distinctive dark, almost black rind. Known for its sweetness and high price.
田助すいかは北海道で生産されている高級スイカです。
Densuke watermelon is a high-grade watermelon produced in Hokkaido.
今年の初競りで田助すいかが高値で落札された。
At this year's first auction, a Densuke watermelon was sold for a high price.