Or maybe they were yelling "Boooooosh!"?? We report, you decide.
Download | play 
Download | play (h/t Scarce)
Cheney got a similar greeting in 2006.
ThinkProgress notes that Paul Lo Duca, the former NY Mets catcher who was mentioned 37 times in the Mitchell Report, was replaced by Manager Manny Acta to catch the first pitch.