For Those Wondering, Here's The Deal With The 'Thumbs Down' Yankees Celebration

This is source I found from another site, main source you can find in last paragraph

The New York Yankees completed their ALDS comeback and beat the Indians in Game 5 (NYY 5, CLE 2) on Wednesday night to advance to the ALCS, where they will take on the Houston Astros. That series begins Friday night in Houston. Here's everything you need to know about the ALCS.

If you watched the ALDS at all -- and I hope you did, it was a very exciting series -- chances are you saw the Yankees giving each other the thumbs down after a base hit. For example, here is Starlin Castro following a hit in Game 4 of the ALDS on Monday:

MLB: ALDS-Cleveland Indians at New York Yankees
The thumbs down is taking over New York baseball. USATSI

Teams around the league have come up with extravagant hand signals after a base hit for years now. Remember the 2010-11 Rangers and their antlers? That kind of started the whole fad. Now it's widespread and pretty much every team in MLB does it. It's fun. It's harmless.

But a thumbs down? That's a little usual. A thumbs up is good, a thumbs down is bad. This all dates back to a home run by Todd Frazier on Sept. 11, during a neutral site game at Citi Field against the Rays. The game was a Rays home game moved there because of Hurricane Irma. Here's the home run:

During the YES Network broadcast, the cameras found a Mets fan in the stands giving Frazier a big ol' thumbs down for the home run. Someone showed Frazier the clip on social media, and he decided to adopt it as his own way to celebrate a base hit. He first did it two days later: