[greymule]

I haven't heard it in a while, but when I played, an umpire who reacted to every comment was a "rabbit ears" (no abbreviation that I know of). The term could also apply to a player (usually a pitcher).

A relief pitcher was commonly mocked as "short-order cook" (again no abbreviation), but I was never quite sure what that term was supposed to mean.

Remember "can o' corn"? Anybody know the origin?

I should say that decades ago, both teams would routinely spew a torrent of supposedly humorous insults at the other team from the first inning to the last. Players usually seemed to sense not to "cross the line" (e.g., no names, only numbers), but anything the opposition could get on you about, they would, and of course the worst thing you could possibly do was let them know you heard them.