A faster version of the dbj. Use a bomb, and just as it explodes, use another. Place the third bomb about halfway up the ascent from the first one. The third bomb can be placed even lower than that, but make sure you still hit it.
The placement of the third bomb causes a lot of upward velocity, and could be the reason 2bjs work with bs jumps when dbjs don't. Combining the two allows for large height boosts and is the main purpose of this move.
To see this move in action, try the link below.