What does trimming mean? trimming. Noun 1. The act of someone who trims. For example, I gave a good trimming to my elderly neighbour’s hedges. 2. Material that is removed by someone trimming something, as a piece of steak. For example, He gave the trimmings to the dog under the kitchen table. 3. An accompaniment to a meal. For example, Christmas dinner with all the trimmings 4. (colloquial, dated) ; A reprimand or chastisting. For example, to give a boy a trimming trimming. Verb 1. Present participle of trim. For example, I am helping my elderly neighbour by trimming his hedge.