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A statement or piece of news that everyone knows, or is out-dated. To describe such a statement as "yestersay" is like discarding it as "so yesterday".
Lisa: "Hey, did you hear that Jane Doe is dropping out of the Republican race?"

John: "Dude, that's yestersay!"
yestersay by nurdsmith January 6, 2012
Words spoken the day before, or prior.
"Just do it" is yestersay.
yestersay by PrairieDawg March 1, 2009
Yestersay- people’s inability to forgive someone’s past misdeeds, despite the incredible amount of actual good the person has done after

-Z
Relationships where one or more parties have previous trauma are plagued with yestersay”
Yestersay by Zachariah720 September 14, 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."