The term 'Hair Gunk' can be summarized by the crossword solution of 'GEL'. GEL is a type of styling product used to hold hair in place and give it a desired shape. It is often made from a combination of water, alcohol, and polymers, and is available in a variety of forms such as creams, mousses, and sprays. GEL is a popular choice for those looking to achieve a sleek, shiny look without the need for heat styling.