Metsed is when a baseball team blows an easy win, when it seems like its impossible to do so. It can also refer to anything that seems like its easy to accomplish but you still manage to fuck it up anyway.
Did you see Luis Castillo last night? Metsed another game.

Dude, how did you not hook up with her last night? I don't know man, I guess I metsed that one.
by Mak15 May 24, 2010
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To catastrophically yet predictably fuck something up. Named for the New York Mets, who have for years had strong teams on paper that get dismantled by injuries, bad leadership, or any number of factors which seem unpredictable to anyone before March (and unpredictable to anyone in Queens before normally September). Commonly referenced in sports media and even among famous Mets fans, like Jerry Seinfeld and Kevin James. The Mets are so synonymous with self-flagellation that using "Metsed" as a reference is common across all sports fans, but especially those in the Bronx (who normally support the New York Yankees), and those from the other National League East markets (especially Atlanta, but to a lesser extent Washington, D.C. and Miami).

Also Metsing, the present participle form, or Jetsed, referring to the Mets' former Shea Stadium co-tenants, the NFL's New York Jets. YouTuber UrinatingTree refers to the same phenomenon as "Lolmets".
"Dude! I told Aaron to mark his exam in the calendar two weeks ago but he slept in! He does this every year."
"Yeah, he really Metsed it this time."

The 2022 New York Mets won 101 games and led the National League East for most of the year, but in a crucial division-deciding series, they got swept by the Braves and then got swept by the Phillies in the Wild Card Series. Even in their good years, they can't help Metsing it all up.
by MarlinsMan2003 October 12, 2022
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To continually take a good situation and fuck it up
The New York Mets have good players but they are metsing it.
by unashamed mets fan June 24, 2019
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