Friendswipe 

Going onto a friends myspace or facebook page and adding all of their friends...

She friendswiped me last night and now she has all my friends!

Friendswipe by Mrs.HughLaurie... March 16, 2009

Friendship poop 

The act of two people taking a poop simultaneously sharing a toilet with one person in front and the other behind.

There was only one workable toilet left, forcing Timmy and Billy to break down that final barrier by taking a friendship poop.

Friendship poop by Chester C. M. March 29, 2010

friend finder 

n. A person who tries to hard to make friends and instead scares people off. Also, an annoying or socially clueless person desperately trying and failing to be liked.

Don''t invite Mary to the party! She's a real friend finder - I spent half the night trying to shake her at the last one.

friend finder by Lex Sleuthor July 11, 2009

Pocket Friend 

one group of friends that you keep separate from another group for fear of incompatibilty or just lazyness

Peter is my pocket friend.

Pocket Friend by Rebekah Browder January 13, 2011

co-friend

a friend who is only your friend at work

At work I do not have any friends, only co-friends and that is because friends at work do not mix.

Or
I only have one co-friend at work and that is Kendhal. We do everything together like take lunches and breaks together, we email each all the time but one thing we never do is hang with each other outside of work, because we are only friends at work.

co-friend by UrbanAsh January 15, 2012

Friendsgiving 

Friendsgiving: the day of the year you want to be thankful for your wonderful friends but end up getting frustrated with them all instead because no one gives a turd about your plans or what part of the day you are looking forward toward.

Mariah made a Friendsgiving event but none of us want to hike so we are all going to bail on her for that part of the day even though she was most excited for it.

Friendsgiving by Josh Kawlie October 14, 2017