Shot in six days.
Tyler Perry says the idea was conceived after watching the film Top Five (2014). In that film, Chris Rock's character enters a movie theater and sees movie goers lined up for a fictional Tyler Perry movie about Madea fighting ghosts in a haunted house. That movie was also called "Boo!"
The film netted $74 million between domestic and international runs and $72 million of that was domestic. Having only a six-day shooting schedule, it made roughly $12.3 million per day of shooting.
In the scene where BJ walks through the living room, the actor is holding the iPad of the film's script supervisor which happened to have a PDF of the script on the screen as the prop was improvised as cameras started rolling on the scene.