Trick or treating is when you go from car to car, or house to house at any month of the year and steal what ever you can. Since you're going to be going in their neighbours car there is no forced entry in trick or treating due to the sound factor (you can do it if you're quite). Unlike on halloween the best time is later at night when everyone's sleeping.
Greedy annoying kids who dedicate October 31st to looking ugly, and seeking out unnatural ways to destroy their teeth while also causing extreme annoyance to anyone with a civilised mind.
This common species of ape is known to become the likes of John Key or Bill English.
When a person is too old to go trick or treating, (usually at age 16) but can't resist the allure of free candy, they take a small child trick or treating so they themselves can go.
My parent told me I was too old to go trick or treating, so I used my friend's little sister as a scapegoat and went and Co-op trick or treating!