Searched wiktionary but seems none of the explanations in it makes sense.
closed as off-topic by RegDwigнt♦ Aug 28 '13 at 10:12
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions that can be answered using commonly-available references are off-topic. A list of these references can be found here: List of general references" – RegDwigнt
You'll want to look up the term break bad:
(colloquial, southern US) to go wrong, of people or events, including to turn toward a life of crime or immoral activity
The title of the series is a play on the phrase.
break : (copulative, informal) To suddenly become.
Things began breaking bad for him when his parents died.
The arrest was standard, when suddenly the suspect broke ugly.