The most advance and effective form of ball-tapping.
A move executed from behind, it involves grabbing the balls from between someone's legs, and pulling them "Down, back and then up." The victim should fall forward due to the nature of the attack.
Being a sneak attack, It is extremely effective and easier to pull off than the common ball-tap.
Variations include just a simple "Back and up" move, exactly the same but without the first Down pull. The victim should be lifted into the air before falling forward; this is very humiliating.
Lyman: So I was standing there minding my own business, when that jerk Matt came behind and Down-Back-Up'd me.
Ryan: Ouch man, slap dat ho
Maybe one day we can all go down-back-upping in the woods!