Ghostbusting refers to the act of searching the floor for possible pieces of drugs that may have been dropped while they were being consumed. Typically seen with users of crack cocaine but sometimes powder cocaine, which is a white substance. They are looking for something that is almost never there.
Don't be ghostbusting in my house, if you can't handle running out!
The act of masturbating to a pornstar you know is deceased.
Yeah dog, I know she died in a freak gasoline fight accident but that gangbang scene is still worth ghostbusting now and again.