Years ago a friend showed me this style, because another friend fo ours used it. I told him the other friend was whacked out on something, but have seen a couple other people throw these since.
Today the Shot of the Day is exactly that - this Turbo Putt, an overhand, level flick w/ the spin of a sidarm throw. Just thrown from head-height. I resurrected that put once last week when putting over a bush about as tell as I am - and made the putt where any other underhand/loft/sidearm wouldn't have been tall enough to get over the bush.
Short Story: Another putt style to add to the bag in case of emergency!