From the Super Mario Wiki
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Bumpety Bombs are explosive wheeled bombs that appear in Kid Icarus: Uprising. If Pit tries to battle a Bumpety Bomb and hits one, the fuse on their heads lights up and they dash towards Pit, trying to catch him in the impending explosion.
Bumpety Bombs also appear in Super Smash Bros. for Nintendo 3DS as Smash Run enemies. The front of their body is armored and will resist all attacks, and it will try to rush at nearby fighters before exploding. Bumpety Bombs are vulnerable from behind, and they can also be grabbed. They can be defeated before exploding, in which case they drop stat boosts. Some Bumpety Bombs explode quicker than normal, signaled by a different animation before exploding.