noun
threesome with two sisters
Vulgar slang term for a sexual threesome involving two women who are sisters. The word is a play on 姉妹 (sisters) and 丼 (donburi, a bowl of rice with toppings), metaphorically suggesting a 'bowl' containing two sisters.
ネットの掲示板で「姉妹丼」という言葉を見かけたが、かなり下品なスラングだ。
I saw the word 姉妹丼 on an online forum, but it's a pretty vulgar slang term.
彼は冗談で「姉妹丼を食べたい」と言って、周りに引かれた。
He jokingly said he wanted to 'have a sister bowl' and creeped everyone out.
A bowl of rice with toppings; in slang, 丼 can metaphorically refer to a sexual situation involving multiple partners, as in 親子丼 (parent and child).
Compound of 姉妹 (sisters) and 丼 (donburi, a rice bowl dish). The slang meaning derives from the metaphor of a 'bowl' containing two sisters, following the pattern of other vulgar 丼 compounds.