Potshot

I. noun Etymology: from the notion that such a shot is unsportsmanlike and worthy only of one whose object is to fill the cooking pot 1. a shot taken from ambush or at a random or easy target 2. a critical remark made in a random or sporadic manner II. verb (potshot; potshotting) intransitive verb to take a potshot transitive verb to attack or shoot with a potshot

Merriam-Webster's Collegiate Dictionary