A guitar strummer is someone who plays a guitar by strumming the strings with their fingers or a PICK. A PICK is a small, thin piece of plastic or other material used to pluck the strings of a guitar. It is held between the thumb and forefinger and used to create a variety of sounds. The term 'guitar strummer' is often used to refer to someone who plays the guitar in a more rhythmic and melodic way than someone who simply plucks the strings.