From the Super Mario Wiki
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A Buzz-Bomb resembles a regular Bob-omb, though it has a small set of wings sprouting from its back, allowing it to fly somewhat haphazardly. Like a Bob-omb, a Buzz-Bomb will explode after some time, though a Buzz-Bomb's explosion seems more volatile than that of regular Bob-ombs, as it is mentioned that a Buzz-Bomb's explosion obliterated at least forty-seven other creatures. The Buzz-Bomb was created by Bowser and his Monster Mixer.
Similarly, in Super Mario Maker and Super Mario Maker for Nintendo 3DS, players can give a Bob-omb wings, thus making it fit the description of a Buzz-Bomb (though its explosion isn't as far-ranged, matching those of normal Bob-ombs).