A bottle rocket that when lit, ends up being a dud. And duds are booty. Hence the name- Booty Rocket.

When a girl (most likely some sort of prostitute) fills a condom with various drugs and inserts it to a mans ass. After insertion, the condom is poped releasing the drugs and causing the man to get a massive erection. Usually, the only way to get rid of the erection is to go to the hospital and get the penis lanced by a doctor.