This is a celebration that the Brewers have been doing for a few months now. Prince Fielder provided some insight to the Sporting News a while back:
"It's from Monsters, Inc.," Fielder told the newspaper. "That's my kids' favorite movie. The whole team does it now. It's something that I saw my kids do, and I thought it was funny, so I thought I might as well do it, too."
Here's what that "beast" salute looks like as shown by Ryan Braun and Prince Fielder in yesterday's game. Yuniesky Betancourt did not do the salute after a triple, so his teammates in the dugout gave him one instead.
The Brewers won yesterday's game 4-1, so we'll see how far this takes them.
Brewers do the "beast" [MLB]