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
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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
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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
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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 12, 2018
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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
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People say that everyone is their day one. Well fix urself cuz u got it wrong. Day ones are people that have been best friends since birth or for several years.
Man 1: yo I got so many day ones dude like their everyone.
Man 2: nah dude, Olivia and Isabella are day ones they've literally been best friends since kindergarten. So no you gotta fix urself.
by Karen_Hit The Whoa October 05, 2019
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