In general, I have always considered that to be a negative connotation, and pictured the green as sort of the inverse soup bowl type, generally highest in the middle and lowered around the edges, as opposed to a green like Pebble Beach 17 that has a distinct, but limited ridge somewhere through the middle. And, I think the ridge had to run perp. to the line of play so the green rejects any landing center or past off the back, whereas a ridge along the line (like PB 17) would be fine.
The negative connotation comes from the inability to hold a shot that hits the middle of the green. I was always taught that this was bad design, usually built be superintendents to assure good drainage in all directions, but I do see some gca's resurrecting it in spots.