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Nesterday 

1. When a 5 year old is trying to explain what he did or is going to do or tell you about something but, since he has no concept yet in length of time to when it really happened or will in the future.

2. A generic "fill-in the blank" day when you really don't know or care about the right answer or your not really going to do it in the first place and blow it off.
Mom: So, Billy when did you make that gift for me at school?Billy answers very excited with a big proud of himself smile: "Oh, I made it like Nesterday or the day before or something!"

Or for the adult with a 5 year olds attitude: when someone calls you requesting a payment of some sort and wants to make arrangements and you answer them with (attitude of course) "Ya, I can pay you like uhm, nesterday. Usually then you end the phone call by giving them "click"and hanging up.

yesterday last time next time never last week next week some day day
Nesterday by GiaMamaMia February 11, 2010
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Yesterday X Separation

Yesterday X Separation (Korean: 옛델대 뷔 셉알앋이온, stylized YESTERDAY / SEPARATION), commonly known as YXS, is a five-member Kwangyanese boy band formed by Throw It Back Rosie Entertainment. The group consists of five members Stoove, Yeoniel, Bengyu, Taerry and Kaimal.
Naega Byeonhae by Yesterday X Separation outsold the whole K-Pop Industry.

2 of 'em Yesterday 

A business term meaning you want Lots of them as soon as possible.

"2 of 'em" refers to the item and means you want lots of the item.

"Yesterday" means as soon as possible.
We need those clothes fast. 2 of 'em Yesterday!
2 of 'em Yesterday by TheGymRat February 27, 2019

Yesterday's Gravy 

Old news; something that has fallen out of trend
Stranger 1: "Hey! Did you hear about that movie that came out last Friday?!"

Stranger 2: "That's yesterday's gravy bro."

nexterday 

I going to Jason's nexterday
nexterday by ThisGirlRightHeah April 15, 2015

I'll call you yesterday 

A sarcastic phrase used to signify that you actually won't call or interact with someone in the future. The phrase implies that you would have theoretically called them "yesterday" if you really cared. This phrase is primarily used a means of blowing someone off.
Jim: So did you meet up with that girl you got coffee with last week?

Nick: Nah, she blew me off and never texted back after. It was an "I'll call you yesterday" type of situation.
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