The 70's game show prize of last resort. Even if you didn't win anything ; at least they sent you home with a box of Rice-a-Roni - the San Francisco treat.
A person you hook-up with at the end of the night out of desperation.
Girl 1: There are absolutely no good-looking guys here but I don't want to go home alone.
Girl 2: Well, take that guy over there home with you; he's not that bad-looking and you can dump him in the morning
Girl 1: Yeah, I guess he's my Rice-a-Roni for tonight