This is what you say when you cannot enunciate the phrase "have a good one". There are a couple of town's named Kill Buck and Salamanca where honky's will use the the phrase habba-goob-un because they struggle to speak basic English.
When you are telling someone goodbye: "Habba-Goob-Un!!"
The Act of getting into a long and complex legal battle in the case of vehicular manslaughter, vehicle damage, crashes; Or any Civil matters including transport.
Larry asks "what is the legal battle about?" john replies "Its a whole habababaloogle."