Gluey stuff is a term used to describe substances that are sticky and viscous. STICKUM, GEL, and GLOP are all terms used to refer to this type of material. STICKUM is a seven-letter word that refers to an adhesive substance, usually made from rubber or plastic, that is used to stick two surfaces together. GEL is a three-letter word that refers to a semi-solid material that is made up of particles suspended in a liquid. GLOP is a four-letter word that refers to a thick, slimy substance that is often used as an adhesive. All three of these words can be used to describe gluey stuff.