For what it is worth, I was taught that it was a "snowplow". Every region has its own names for stuff.
I don't mind a little banter, but there needs to be a limit. I think the challenge with being funny in these situations is that you don't really have an audience (that you can see/hear), so that when something is not going over well, or has been running on for too long, you don't get that feedback like you would if you were on stage. I think there is a tendency to think that if your broadcast partner is amused, then so is the audience.