Yesterdaddy 

The father of the child (or children) of a divorced couple in which the mother has since re-married.

Hey, who is that creepy guy in the minivan that's watching us play softball?
Oh, him? He's just my yesterdaddy. He's just a little depressed since my mom married Biff.

Yesterdaddy by yesterdaddy June 18, 2009

Yesterdaddy 

noun - Term used for the guy I dated last year.

"Who's that? He's hot!"
"Oh him? He's my Yesterdaddy."

Yesterdaddy by ActingBoy September 5, 2011

Yesterdaddy 

noun.

An individual who was up until recently employed as a Sugar Daddy.

Chadwick got a demotion and now can't buy me my weekly new shoes or take me to Sicily. So I made him a Yesterdaddy. Buh-bye!

Yesterdaddy by Meaty Air Biscuit November 4, 2021

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