Calling people "Dawg" is easily my worst habit ever. I just called the middle-aged lady in accounting (here at work) "Dawg". ("What up dawg? Let's get this payroll sorted out!") In my world, "Dawg" is a non-gender-non-status-specific pronoun that is pretty much ubiquitous. Everyone gets it sooner or later.
I have other bad habits but this one is the most humiliating.