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.
Person 1 - “Hey would you like to go for a moo moo sharoo?”
Person 2 - “Of course I’ve got nothing else to do, let’s go to Poundland.”
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.
Person A- Dude, I'll House Shaboom those people if you pay me $20.