I've been googling for the last 2 minutes and I just can't come up with anything that talks about "shots". Maybe this is a local Toronto term. Here's the definition as I understand it. A shot is when all members of the band accent a particular section note or group of notes. This can be done in unison or not. What is the proper term for this? Yes, I understand that you could call it an accent, but that's not how it would be said if you were playing in a band.
Here's an example (although it's not a super strong example):