yesternium 

A new element in the periodic table that alters the past.
Specifically the past millennium.

80's radio announcer: Time travel to the past 1000 years in a jiffy is now possible thanks to the discovery of the element: yesternium!

yesternium by lilsnsh July 8, 2019

Yesternight 

Last Night.
Yesterday Night.

Dude, Mark got so shitfaced yesternight, I think he went home with that gay guy James.

Yesternight by ZACH BAMF June 23, 2008

YesterDump

The dump that almost immediately follows consumption of a YesterDog hot dog.

Also see: YesterRia.

I ate 2 YesterDogs and when I got home, I had to kick my roommate out of the bathroom so I could take a YesterDump.

YesterDump by daytona August 14, 2006

yesternite 

slang for last night, mixes yesterday with night...yesternite

yo keldog yesternite was off the hook

tzibit where were you yesternite

yesternite by tzibit October 6, 2006

yesternight 

Yesterday night.

So, what happened yesternight, anyway?

yesternight by Bobert June 25, 2004

Yestertime

Yestertime- (n.) a non-specific referrence to the very recent past when something happened or something was supposed to happen. syn. Lastertime, Yesterday (etymology: North America 2000 Allegra Davis a small child invented the word from yesterday, last-time and yesteryear mix)

"Mommy, yestertime you let me swim naked in Nana's pool."

"You said yestertime you would put that horn on my bike?"

Yestertime by Captclam July 27, 2006

Yesteryums 

Leftovers

I ate all the yesteryums

Yesteryums by Pman976 April 6, 2010