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!"
John: "Dude, that's yestersay!"
by nurdsmith January 05, 2012
Beni went all out telling me about the 13 year old father in the UK, but I knew about it already. This news is so yestersay!
by annie004 February 20, 2009
"Just do it" is yestersay.
by PrairieDawg October 24, 2008
Yestersay- people’s inability to forgive someone’s past misdeeds, despite the incredible amount of actual good the person has done after
-Z
-Z
by Zachariah720 September 15, 2020