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yeasterday 

Da previous day when ya did baking and/or brewing.
During Prohibition, many bootleggers would discreetly refer to da previous day of moonshinin' as "yeasterday" when da "revenooers" were within earshot.
yeasterday by QuacksO June 3, 2020

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."

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.

Yesterday's chili 

One's vulva or vagina
"I'm just going to go wait in Brian's office and warm up yesterday's chili for him."
Yesterday's chili by Taffy Esterhaus November 23, 2016