Thrums is a term used to describe low humming sounds. It is derived from the Scottish Gaelic word 'drumm', which means a low, continuous sound. This term is often used to describe the sound of a guitar or other stringed instrument being strummed. It is also used to describe the sound of a hummingbird's wings flapping. Low humming sounds are often associated with relaxation and can be used to create a calming atmosphere.