I feel rather stupid and like I should've known, but I didn't... 
You know where you charge a shot, spin jump off the side of a wall, then roll up to hold a charge in the ball form in mid-air? After a few seconds the bombs release and bounce/fly very high.
I was playing a SM hack, and happened to charge a shot, then I just rolled up into a ball.... I did the same thing as with the 'jumping off the wall' technique.
I guess it's just a matter of holding DOWN.
I'm certain many of you know this too. But I once asked how to do this... The top most explanation was what I was given.

You know where you charge a shot, spin jump off the side of a wall, then roll up to hold a charge in the ball form in mid-air? After a few seconds the bombs release and bounce/fly very high.
I was playing a SM hack, and happened to charge a shot, then I just rolled up into a ball.... I did the same thing as with the 'jumping off the wall' technique.
I guess it's just a matter of holding DOWN.
I'm certain many of you know this too. But I once asked how to do this... The top most explanation was what I was given.
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