What does "Pre-Roll" mean?
Definition: A pre-roll is a term made popular through media and advertising companies. It was once used to refer to the advertisement that plays before featured content. In today's culture of legalized marijuana, however, the term has an entirely new (and way cooler) meaning: a pre-roll is a joint/blunt that is made beforehand and sold by a dealer, dispensary, or retail store. These types of joints are sometimes undesirable because the customer can never know definitively what blend is really in the joint. Also, the joints are probably licked and sealed using another person's saliva.
Example usage for Pre-Roll
"My dream job would be making pre-rolls professionally."