The phrase is used as an insult or an interjection expressing disgust or anger. Derived from the Jamaican word bomboclaat, bomboshart is a combination of bomboclaat and shart.
Joe: Hey, where have you been all day?
John: Just finished up in the washroom.
Joe: “BOMBOSHART”
Someone with an unhealthy obsession with Bobby to the point of liking them more so than their own family members or significant other. A semi codependency on their interactions with a Bobby to the point of almost constant contact via messages.