The Noda Bihudah, if I recall correctly, defends those who have such a practice as we seek to make our tables similar to the Mizbeach, and the meat that was to be placed on the fire on the Mizbeach (altar) in the Temple was thrown (past a gap between the ramp and Mizbeach).

I was told orally that the Noda Bihudah, if I recall correctly, defends those who have such a practice as we seek to make our tables similar to the Mizbeach, and the meat that was to be placed on the fire on the Mizbeach (altar) in the Temple was thrown (past a gap between the ramp and Mizbeach).