Friend Poaching 

When one friend befriends another through your introduction, soon putting more effort into that person than you do, simultaneously making you seem less desirable and devaluing both your original friendships. This can happen consciously or unconsciously. Notably, one does not tend to ever make any new friends for themselves through the friend poacher.

I used to be close with Guy until I introduced him to Buddy, who started inviting him out all the time; I think Buddy is friend poaching, especially considering I've never met any good friends through him.

Friend Poaching by Jernstar October 1, 2016

Second String Friend

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed

I got a call from X the other night. She had an extra ticket to a concert she bought for a friend, but they couldn’t make it so she called me to ask if I wanted to go because I am her Second String Friend.

Second String Friend by Deus-ex-machina August 26, 2020

favorite friend 

Someone who is so special to you that they are differentiated from all of your other friends. A Favorite Friend is similar to A "Best Friend" except you can only have one. There is a special unexplainable bond created between Favorite Friends, simply because you are each other's favorite humans. You know this person will always be there for you and has a significant role in your life.

Everyone has best friends, but it's very rare that someone will find their favorite friend.

favorite friend by H<3M April 30, 2016

Friendship

True friendship is not when you go to school and hang around with someone just because you have no one else to chill with. Its not calling someone up when your bored because they are fun to talk to. Its not when you cant think of a birthday gift and end up buying your friend a wal-mart gift card. Is not when you have to talk to someone about something you don't particularly care about (like how much snow we got last year) to avoid an awkward silence.
Friendship is when you love someone with every ounce of your being and genuinely want them to be happy even if it means sacrificing something your self to make them happy. A true friend is someone you can talk to about your feelings, someone you can tell things you could never tell your family or even your partner. They are someone who you don't have to talk to but someone you want to talk to; someone you will go out of your way to be with. Friendship is when you love someone so much you want to hold them and never let go, someone you want to rest your head on and cry, and you would let them cry on you too. Its someone you can talk to about things you disagree on and end up being closer for that disagreement. Its when you think about someone and how close you are to them and how much you love them and you smile and are happy all over.
Friendship is when your love for someone exceeds your need for them. (the Dali Lama said that)!

Bill and Lisa are real friends. They are physically opposites, have completely different tastes and interests and see each other very infrequently. But they both know the other will be there for them no matter what, and that is friendship.

Friendship by Ulmo August 16, 2008

Friends+ 

Or Friend+
Friends who have feelings for one another but are not dating yet still fool around sexually, and as such are not restricted from dating other people and talking about those dates together like friends do.

Different from FWB - friends with benefits - which denotes friends who are just friends and sex partners but are not interested in dating romantically.

Friends+ do not have what it takes to actually date each other. Could be time, like both are in grad school and working full time and other family obligations. Or, emotionally unable to tie themselves to another person because the last relationship left them too scarred. But, there is mutual interest in potential romance.

Often the friends+ relationship looks from the outside exactly like two very busy people dating, but neither is willing to call it dating.

On social media it is referred to with #f+

“I thought you were dating Michelle?”
“No, we’re friends+. We might date when we graduate.”

Friends+ by RennyRenwick February 21, 2018

Friend Custody

When a couple breaks up, one person gets to keep the mutual friends while the other must find new ones because being around each other would be too awkward. The person who keeps the friends is said to be granted Friend Custody.

Bob: Why don't you come out with us tonight?

Phil: Because when Jane and I broke up, she got Friend Custody.

Friend Custody by thebetterfriend2 March 20, 2010

Friend of Gilgamesh 

A term expressing a platonic relationship between adult males. The original use refers to the mythical king Gilgamesh, and his non-sexual friendship with the character Enkidu.

Montgomedy Sweelard is off traveling with Radrigo on some grand, manly adventure. Joe is a true Friend of Gilgamesh, and thus undoubtedly heterosexual.

Friend of Gilgamesh by Radrigo July 14, 2023