After grounding out in the first, Mora was caught looking at a knee-high fastball from left-hander John Parrish for the first out of the third. He remained at the plate and yelled at Drake and was ejected as manager Dave Trembley ran out to try and break up the argument.
As he left the dugout, Mora picked up his bat and flipped it into foul territory as Aubrey Huff was batting.
Mora, who is batting .283 with 23 home runs and 99 RBIs in 128 games. It was the first ejection of the season for Mora, and the 12th for the Orioles.
Huff moved from first base to third, with Kevin Millar replacing Mora.