trick or treat exclamation 1trick-or-treat verb 1forms 3 exclamation1 •A form of a light-hearted request by which children obtain candy on Halloween while wearing themed costumes.Meet the others at the store, / Knock on other people's door / Trick or treat they have no choice, / Little ghost's are makin' lotsa noise — 1987 trick-or-treat verb1 •To go door-to-door requesting candy on Halloween night while wearing a costume. formstrick-or-treated · trick-or-treating · trick-or-treats