The term 'drum effect' refers to a variety of sound effects that can be used to enhance the sound of a drum. The most common drum effect is the 'ROLL, ' which is a repeating pattern of notes played on the drum. Another popular drum effect is 'tomtomdelay, ' which is an effect that creates a delay between the initial drum hit and the subsequent hits. This creates a more complex sound and can be used to create interesting rhythms.