yesterself 

The person that one was yesterday, particularly when one’s thoughts, emotions, or appearance have changed.

I can’t believe my yesterself hated tomatoes.

My yesterself was such a jerk.

yesterself by precurious_being October 16, 2023

yestersex

Sex that happened the day before.
Yesterdays sex

Dude 1: Hey man, yestersex with Kate was hot!
Dude 2: I bet!

Dude 1: I always feel great after yestersex!

yestersex by crazywacz November 16, 2012

Yesterseason 

The sporting season prior to the current or upcoming sporting season.

Inadvertently coined by a Dallas sports radio morning show

Guy 1:The Mavs are awesome they won it all!

Guy 2: That was yesterseason, what are they going to do this year?

Yesterseason by Pykaa August 14, 2012