(GIF via @So_Truculent)
If you read Carter's lips, he appears to say the word "jackass." One would imagine that was directed at Perry. The two were teammates for Canada at the Olympics, by the way, but that was so long ago.
Carter and the Kings wound up winning 3-1 to go up 2-0 in their Stanley Cup playoff series — and they got their shots in on Perry. To his testicles, specifically.