Mysterious legend

A menacing legend about a mythical beast. The beast liked music and danced to the rhytms but the songs were later found out to his random beeping and booping combined with sounds like "oouh" or "aaau" and many others. He also liked playing a game which controlled what seemed to be a lego man in modern days context. He likes to destroy everything he sees and would not hesitate to slapp with his big fat ass hand. If something was living, friendly or not the beast does big slapp on it. That's all researchers have found on this topic. Not known much about it, they decided to call this the mysterious legend. This legend, one of the most mysterious ones out there remains unsolved.

It can be used randomly to confuse people.
Person 1 "hi how's it going billy"
Person 2 "have you heard about the mysterious legend?"
Person 1 "what is the mysterious legend"
Person 2" the mysterious legend? You don't know? Search it in the urban dictionary"