The Menacing Ball is the the ability a Tailed beast can create when gathering raw chakra either from their bodies or the air around them into a single compressed ball. This ball of chakra can either be consumed, where the explosion is fired from the mouth, or fired directly. The power of the attack is relative to the power of the user.
The Three-Tailed Giant Turtle fired two similar techniques that caused a shock wave instead. It is unknown if they were a Menacing Ball or not.