Definition
A brief and casual sexual encounter, typically lacking deep emotional involvement.
一夜情
They had a roll in the hay after the party and then went their separate ways.
他们在派对后有了一夜情，然后就分道扬镳了。
He admitted his mistake of having a roll in the hay with a colleague while on a business trip.
他承认在出差时与同事发生了一夜情的错误。
She was just looking for some fun, a roll in the hay, not a serious relationship.
她只是想要一些乐趣，一夜情，而不是认真的关系。