There are a couple of levels to this. In one sense the lyrics are especially true or vivid or natural - they have not been processed by a record company to sell records to kids, think of the difference between raw sugar cane and processed sugar. The singer might be describing a break-up in a way that the emotional pain is communicated to those who hear the song. There are also visual ideas of raw meat here - this singer had been wounded by the experience that they are describing and the wound is still open and painful. Hope this helps.

Thank you!Is this expression commonly used?@Brando

Hi Baron, in this context, 'raw' can mean that the song lyrics are very emotional.