A girl/guy who you hook up with a couple times and then move on. You get the term "paper cup" because you use paper cups once or twice then throw them away.
Girl- "Yeah, we hooked up at the party but I haven't heard from him since."
Friend- "You're his paper cup."
By Isadora
Paper Cup Action
Noun. A reminder written on the fly, on one of those paper cups that corporates buy by the million, usually in a hurried and unplanned meeting where no other writing material is available.
"I was just grabbing a coffee when Madeline pounced and I ended up with a paper cup action."