Someone who’s been with you since the beginning and generally supports you. (Could be from the beginning of a certain period of time or situation.)
My Mom has been with me all my life. She is my A one from day one.

John is my A one from day one. We started this job at the same time.
by LiteBrite169 December 22, 2021
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Spoken by Josh strife hayes after a 5 option poll somehow broke
This stream is One Hundred And One Percent Based
by Flamewindhoe June 11, 2022
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The psychological sequence that involves an individual who only displays one barefoot (and another foot that has a sock or any foot covering on), especially to record a video or take pictures for sexual gratification or attention. This term is specifically focused on individuals who prefer having only one barefoot shown rather than both barefeet at the same time.
Some videos on YouTube demonstrate "only one sock on, one sock off" conditioning to sexually attract some individuals (predominantly males) who prefer over some videos that show both barefeet at the same time.

A man who records feet videos of any woman uploads a video that demonstrates "one sock on, one sock off" conditioning.
by ttrungraj May 20, 2023
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A sexual maneuver where a man and woman are partaking in casual missionary sex, and another man is anally penetrating the man that is currently in the missionary position. A second female then mounts the face of the first female, and gets cunnilingus performed on her.
Bro, did you see that porno where they one thousand-eleventy-oned? It was epic.”
by Krispy Bizkut April 25, 2018
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A Navy Seals adige meaning if you have two things and one breaks you always have one left but if you have one and it breaks, you have none
“I was in the water and my googles broke. Then I couldn’t stay down any more”

“Dude, two is one and one is none. What were you thinking?”
by BMc2 September 19, 2023
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That question was as eaasy as one plus one.
by Great Boii September 8, 2023
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To bust one in one...This is the phrase used to describe a highly dangerous sexual manoeuvre which usually involves two people.Firstly, there is extreme stretching of the rectum and sphincter area of one of the two involved. After this initial stretching of the "asshole",the other participant shoves both penis and hand into the gaping hole and proceeds to masterbate excessively inside the rectum tearing the sphincter up horrificly causing a high degree of anal tissue damage. Of course if the stretching of the rectum is big enough more than just one person can bust one in one at the same time...
WILSON- Hey moe, fancy going upstairs stretching my sphincter apart with pliers and busting one in one?

Moe- I thought you'd never ask...PRESENT THEM
by Mr.scrotum October 15, 2006
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