Life Buddy 

Friends who are always there for each other.That they'll see this life through together. They live separate lives but they’d always be there. Even if they don’t speak for five years, their friendship would still be there. Additionally, life buddies are entitled to care for each other.

She is my life buddy even though we live in separate countries and have not seen each other for a few months because we went through a lot with each other.

Life Buddy by fittingyou August 10, 2009

Life Buddy 

Two people who care about each other and decide to hook-up and be monogamous without the actual emotional investment that one may put in a official relationship (more than just friends with benefits).

my best friend and I decided to be life biddies(plural of life buddy)

Life Buddy by cloud9baby June 8, 2016

bff buddy for life 

1. someone that a person hangs out with all the time, or sees a lot, usually on a daily basis
2. a person with whom someone shares and intense and close relationship with
4. a good friend who does not have a distinct term or title like "homie" or "best friend" or "sister" etc.
3. a sarcastic term used to identify someone that a person doesn't particularly like, has just met, or has not seen in a long time

guy: hey! i can't believe you told ___ i gave you flowers!
girl: well she's my bff buddy for life!
guy: i thought i was your bff buddy for life!
girl: you are .. you're my guy bff buddy for life. :)

cousin1: hey look! here's the profile of your bff buddy for life on facebook!
cousin2: ugh, she just sucks. i'm surprised she has any friends.

bff buddy for life by ang e lica July 10, 2007