BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
While searching for answers in his quest to become a Jedi, Luke Skywalker has uncovered a Journal written by Jedi Master Obi-Wan Kenobi. The Journal details Kenobi's adventures while watching over young Luke on Tatooine, including when Jabba the Hutt hired the Wookiee Black Krrsantan to hunt Obi-Wan down for defeating his thugs during the Great Drought. What follows is an excerpt from that Journal.