Long long ago (summer of 2015), I was on the 3rd floor of an electronics mall in Taipei, Taiwan when I walk into a somewhat sketchy looking shop. To my delight, they were selling a whole bunch of cool stuff (Arduinos, Raspberry Pis, robots, etc.). After looking around a bit my eyes settled upon a plastic chassis (I had attempted hacking a really old motorized toy I had with my Arduino before with limited success). I bought the chassis with the intent of getting my Arduino to control it someday.
Toward the end of summer of 2016 (about a year later), I was bored and decided to build a very small box like robot using the chassis that I had bought. Instead of using the full chassis, I decided just to glue the gearbox motors together with a piece a cardboard resulting in a much smaller size.
I would often bring this contraption to school with me and a friend started calling it my little bug. Hence, as a joke, I named it B.U.G., the Basically Useless Gearbox.