noun. A secret about other people that can not be shared with other parties without the express written permission of the parties involved.
man 1: Did you hear about how Dave got that stripper fired last week?

man 2: Shut up, that's Major League Baseball.
by tedsghost July 16, 2008
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An interjection that is either used to express congratuation or confusion.
Example 1:
Hiko: I just got into this new university for smart people!
Hako: MAJOR LEAGUE FUCKIN BASEBALL
Example 2:
Hiko: Explain why there is a cat in the fridge?? It's only us.
Hako: MAJOR LEAGUE FUCKIN BASEBALL
by MissSaikou September 17, 2023
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