A trip to a shop to ‘mooch’ around, usually just looking at stuff and on the occasional trip picking up a small item. The shops are usually British shops such as Poundland. A moo moo sharoo has no specific purpose other than too full your time.
When Trick-or-Treating, as someone opens the door to give you candy, you run through their house. This act is usually followed by exiting the house naked, while leaving the owner a "Trick-or-Treat Surprise" on their couch and/or pillows.