A One day stand is a more innocent form of "one night stands," It's when you meet someone for the first time, flirt with them constantly all day, call eachother cute/pretty, hold hands, and maybe even kiss. Then you never talk to them again after that.
Person 1: "Are Julie and Zack going out?"
Person 2: "No, they kinda just had a One day stand."
Person 1: "ohhh,sucks."
A term used by transients and travelers to describe a friendly relationship between two, previously unacquainted parties. The relationship develops quickly and ends abruptly as one or both parties is just passing through or soon to leave town.
Man: What'd you do yesterday?
Woman: I met this incredible couple from up north at the cafe. They're on a train trip around the country. We laughed and shared stories for hours until they had to head back to the station for their departure.
Man: Classic one day stand. It's too bad they couldn't stay longer; sounds like you really hit it off.