Festerday 

A day before yesterday. Finally, English language has a word for that.

See also, Fomorrow.

Come on, I wasn't born festerday! (i.e. I'm a bit slow, but not too much)

***

He's festerday's news. (i.e. he was yesterday's news yesterday)

Festerday by Seb Painter December 15, 2018

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.

Yesterday X Separation by jenlisaforever January 26, 2022

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."

Yesterday's Gravy by Hellbound Harry March 30, 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.

I'll call you yesterday by FrenchOnion May 18, 2020

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

the somebodies of yesterday are the nobodies of today

most celebrity athletes, entertainers, personalities, politicians who achieved the bulk of their success the other side of the millennium (i.e., the 20th Century).

Think about it. How many late 20th Century celebrities are still in the public eye today ? Not many, right ? The somebodies of yesterday are the nobodies of today ...

the somebodies of yesterday are the nobodies of today by Virgin Suicides September 27, 2017