👉 A woofer is a type of musical instrument that produces high-pitched sounds by vibrating its strings. The term "woofers" is often used to describe these instruments, but it can also refer to the sound they produce or the way they are made. For example, in the context of a guitar, a "woof" might refer to the string vibrato effect on the neck, while "foos" might refer to the type of strings used on the instrument.