A phrase common to Guidos hailing from the greater New York City area, mainly in the Jersey suburbs. It is used interchangeably with "piece of cake". It is also commonly accompanied by a brief grab of the testicles.
Eh ma! Ma! Make me a pizza pie! C'mon! It won't take long! Bada bing bada boom! You'll be done in no time!
Often heard in the order "badda bing, badda boom", the phrase is a way of saying, "That's it, it's all taken care of". The exact origin of "badda boom, badda bing" is a mystery, but the best guess I've heard is that it started as a verbal imitation of a "rim shot," the drummer's punctuation to a comic's punchline in the old vaudeville routines.
"We set the Judge up with a hooker, Louie busts in with a camera, and badda bing, badda boom, case dismissed".