A type of scam in which one pretends to have been hit by a person's vehicle in order to squeeze some money out of the driver, usually in court or in the form of insurance payouts.
Guy 1: So, hahe's da plan. I pretend da car hit me, and we take da drivah ta court, and we sue him till we got all da money in his account. Sound good?
Guy 2: Ah, a flopsy. ...Ah, fuhgettaboutit. He probably gotta dash cam.
A casual date (usu. a young woman) invited to dinner (or drinks or a weekend away, etc.) in order to make up numbers rather than out of any genuine romantic interest.
Jules: I didn't fancy going alone so I called up a random flopsy.