Upfriend 

(v) - to gain a better quality friend from a mutual friend.

My friend Jason asked if his friend Glenn could come to dinner with us. After meeting Glenn, I had to upfriend him.

Upfriend by gambler325 June 16, 2016

Reverse Upfriend 

(v) When a friend or relative's friend befriends you after meeting you. This is not as common as upfriending but does occur occasionally when the friend's friend realize you are a upgrade. This is the ultimate insult to the original friend or relative.

Eric and Christine reverse upfriend. Eileen and Johnny by inviting them to the neighborhood barbeque

Reverse Upfriend by gambler325 June 16, 2016

The UNfriend-zone 

It is when your friend finds a new piece of ass/interest and you soon find yourself becoming nonexistent to them. Its more common between a male and female friendship then a same sex friendships.

Megan: "Hey have you noticed since Brad started talking to Kelly he stopped talking to me."
Steve: "Sorry to say this but no matter how you look at it you are in The UNfriend-zone."

The UNfriend-zone by Dat Vern August 17, 2012

back-up friend

an acquaintance that is only spoken to when all of one's real friends are absent.

A: Why were you talking to Erik that other day?
B: Dude, he's just a back-up friend. nobody else was around worth talking to.

back-up friend by assgoblin82 February 3, 2007

Back-up Friend

A friend who isn't really part of the group, but who you hang out with when the rest of the group is gone.

Why isn't Kailyn paying any attention to Meggie?

Oh, Meggie's just her back-up friend. She's talking to Ashley right now.

Back-up Friend by Sleet October 22, 2009

Preemptive unfriending 

When one deletes a friend from Facebook because he or she knows that the Facebook friend in question would eventually delete them instead. Preemptive unfriending thus robs the deleted Facebook friend of the joy of being able to delete them.

John: Why'd you delete Bec from you friend list?
Adam: I knew she'd eventually delete me so I wanted to take the satisfaction of unfriending for myself.
John: Ah, a preemptive unfriending.

Preemptive unfriending by AntonBordman August 31, 2012

eco unfriendly 

a person or object that is extremely against saving the world

chainsaws are very eco unfriendly

eco unfriendly by ___^^))__ April 28, 2008