Usually a person in a relationship. It's the combination of the word baggage (stress) and control (release). When one person in the relationship uses the other person (the bagtrol) to take all their stress out on.
Person 1: "Wow did you see Joe today? he seems really depressed."
Person 2: "Yea, he's become his girlfriends bagtrol"
Person 2: "Yea, he's become his girlfriends bagtrol"
by CytCyd November 3, 2011