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1.
(from the movie Fight Club) A "friend" you meet once, for example on a plane, and never see again.
"Tyler, you are by far the most interesting single-serving friend I have ever met."
автор: Amanda 20 апреля 2004
 
2.
A person you hold a conversation with while waiting in a public place, odds are you will never see this person again. You can make single serving friends while in line, on public transportation, at the movies, at amusement parks etc...
Don't let Kendra talk to strangers at Walmart, she attracts the weirdest single serving friends.

While at the movies, I made the coolest single serving friend, he was an author and could ride a unicycle.
автор: Ayelura 20 октября 2011
 
3.
a friend that you make on a airplane, seeing to it you will only see/hear from them once. after the flight is done, you most likely will not ever see or hear from this person again.
P1) you are a single serving friend, my man.
P2) What's that?
P1) When you become "friends" with someone that sits next to you on a plane.
P2) Oh well then, I guess i better get going cause the plane has just landed.
P1) aight, well then see yah around.
автор: Christian Encina 20 июня 2008