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 06, 2012
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