Bush league low end is the correct answer.
Unbelievable, he's doing this verbally? I find this, in some ways, akin to coaches who shout things out to their batters or teams in reference to the opposing pitcher, like, "He can't throw a strike, he's tired!!" or, "He's got nothing!" Not so sly efforts to undermine the confidence of the opposing pitcher. I've seen this for years in youth ball coming from more than a few coaches.
Makes me sick. As a coach, when i hear this sort of thing, I always call a time out, motion for a meeting with the blue and the other coach who is doing it, and then proceed to ask the ump what good could possibly come from this and if that is "coaching". Then I try my best to, quietly and sensibly, rip the coach and his competitve values, reminding him that the kid he's referring to is a kid, before walking away..leaving the other coach and the ump alone for a few seconds. The ump almost always appreciates the fact that it was done as a conference and issues a "suggestion" to the other coach.
This guy is coaching high school ball? Makes me wonder where these slugs crawl out from and how long they have gotten away with such profound ****. That kind of thing really destroys the elegance of the quiet communication that occurs in a properly executed ball game.