What does BUWAHAHAHA mean?

BUWAHAHAHA meaning in Urban Dictionary

It really is a sinister and phony laugh, just like one would hear from an evil villain. Clearly, there are few villains around today , apart from staff members of FOX "news", when one types it these days they are making fun of theirself. It beats the heck out-of attempting to make an emoticon to mirror the intention of whatever wickedly sarcastic thing they certainly were saying.