Been there since the beginning; through the bad times
That's my day one homie.
by Badboyx May 20, 2015
A person who has been down with from the first day y'all met even thru good and bad
Psycho is my day one homie since the early 90's
by Shadow24 December 30, 2016
A day one is someone who you know beyond time. Someone who is always in your life even when you're reincarnated they will find the way to find you back again. Ride with me and I will die for you. We always got eachother his/her back. Shorty here for the rescue
A Day one is someone who knows you for centuries
by Shorty is alive and kicking it October 29, 2022
one who’s love grows for you as they grow with you.

IG: @free__key
Tyla and I have been best friends for 10 years through all the bullshit, she has remained. She’s a real day one! 🙌🏾
by Free__key February 12, 2019
The worst map on Gears Of War 2, it is chosen by noobs and has awkward gameplay for all modes.

It should never be chosen during online play
oh wtf who voted Day One!

oh damn it tied and we have to play day one, long to that!
by I Am Marcus Fenix April 29, 2009
I want someone to be my day one someone that I could easily talk to and hug everyday and talk to 24/7 like a sister ❤️💯
Day one mean someone who’s there for you 24/7
by J boat October 13, 2018
A female partner who has stayed with you for a long time through good and bad times.
Happy birthday to my girl and my day one, I will love you till the end
by JDub555 April 14, 2016