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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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3
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 June 10, 2016
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5
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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6
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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