Baseball Stuff 

adjective. a total lack of interest in reference to a conversation.

Friend 1: Dude check out the wheels on that mustang!! Friend 2: Yeah Baseball Stuff

Baseball Stuff by Diet Dr. Thunder May 9, 2009

Inside Baseball Stuff 

A metaphor in American slang that refers to the inner workings of a system that are only understood by the experts. To understand Inside Baseball Stuff, one must have specific knowledge of the subject discussed that is not generally understood by outsiders.

What's the purpose of this email notification? I thought the issue was resolved last week or is this just Inside Baseball Stuff?

Inside Baseball Stuff by GFE-Lover February 28, 2022